CTM64 (Contact To Midi Converter) Version 4 User's Guide
Contents
1. 8 9 potentiometer connectors for pitch bend modulation volume and after touch ST1 ST2 ST3 ST4 page 6 CTM64 Version 4 User s Guide Power supply 1 The CTM64 does not have a built in power supply Instead it uses a plug in type external power supply AC adapter One reason for this feature is electrical safety Keeping danger voltages main out of the CTM64 increases the electrical safety Therefore an external power supply of high quality and safety should be used If the keyboard is used in Germany the external power supply has to be VDE approved Another reason for the external power supply is the fact that line voltages and plug types vary considerably from country to country Using a plug in external supply the CTM64 can be used any where with a locally purchased power supply thus keeping the retail price down The power supply must be able to deliver 7 12 VDC unstabilized voltage as well as a minimum current of 100mA The CTM64 is switched ON by plugging the AC adapter into a wall outlet and connecting it to the appropriate jack on the CTM64 board There is no separate ON OFF switch If the polarity of the power supply is incorrect the CTM64 will not function However there is no danger of damage to the circuitry since it is protected by a diode The correct polarity is outside ring GND inside lead 7 12V The power supply is not included with the CTM64 and has to be purchased separately Midi Out 3 Connect2. For the control change messages the same parameters as for the note messages are taken i e the note number corresponds to the control change number Remark The state of JP8 is checked only once during power on It is not possible to change the operation modes defined by JP8 during operation CTM64 Button Board and Front Panel As an addition to the CTM64 main board a button board with 64 momentary switches is available The switches are arranged as an 8 x 8 matrix The connection between the CTM64 main board and the button board is established by four 16 pin ribbon cables In addition the common connector JP6 of the main board has to be wired to one of the corresponding pins of the button board only one of the three pins of the button board is used for this Even any kind of single pole connector can be used for this connection to enable a separation of the two boards without soldering CTM64 BUTTON BOARD EEE EEEa E u E U a a fin o LS SS sim ot only one is wired to JP6 of the main board MU o U IG C E o WIS O DOEPFER O CTM64 Version 4 User s Guide Page 17 Even a Suitable front panel is available The panel is punched matching to the 64 buttons and four mounting screws The pc board is mounted to the front panel by means of four M2 5 counter sunk screws distance bolts and nuts The measure of the front panel is compatible to the 19 inch standard 3 U height 12
3. be in the range of about 5k 250k Instead of the usage of potentiometers also control voltages may be applied to the middle pins of ST1 4 provided that the applied voltages are in the range of 0 5V Attention Negative control voltages lt OV or voltages higher than 5V applied to middle pins of ST1 4 will destroy the CTM64 Please pay attention to the warranty notes on page 1 Ignoring these notes causes warranty loss and the right to return the goods The scan rate for the potentiometers i e how often a new value is transmitted via MIDI out is fixed to a suitable value so that each control change is recognized very fast but the MIDI line is not blocked by too many data From our experience many MIDI devices would have problems to process the incoming MIDI data in case of a too high scan rate We are planning an additional small hardware that converts voltages beeing not in the required range to the necessary 0 2 5V range e g 2 4V 0 2 5V Please ask if you are interested in this supplement board to CTM64 It will probably be available early in 2001 and consists of a small pc board with 2 trimming potentiometers that are used to adjust voltage offset and scale amplification One side of the board will be connected to ST1 or ST2 the other side to the controller that outputs the voltage range page 8 CTM64 Version 4 User s Guide Contact 1 64 10 and Common 11 The 64 contacts are connected to four double row
4. jumper channel 11A 5 1 6 1 7 1 8 2 if 2 A 2 2 3 3 3 3 4 I 4 1 4 I 4 JI jumper channel jumper channel jumper channel jumper channel 1 9 1 10 1111 1 12 2 2 2 2 3 3 3 3 4 4 4 4 jumper _ channel jumper channel jumper channel jumper channel 1 13 1 14 1 IE 15 1 16 2 2 i 2 2 3 3 3 3 4 4 4 4 If a jumper is set the corresponding number is printed bold E g for MIDI channel 1 all jumpers 1 4 have to be installed This is the factory setting page 10 CTM64 Version 4 User s Guide Mode jumper 5 Jumper 5 installed note mode factory setting Jumper 5 removed program change mode Note program offset jumper 8 Jumper 8 installed offset 0 factory setting Jumper 8 removed offset 36 in note mode resp 64 in program mode Octave offset jumper 6 7 working only in note mode Jumper 6 installed offset 12 semitones minus one octave factory setting Jumper 6 removed offset 0 no transposition Jumper 7 installed offset 12 semitones plus one octave factory setting Jumper 7 removed offset 0 no transposition If both jumpers are installed there is no transposition 12 12 0 Control LED 4 The LED is used to display any MIDI out activity After power on the LED is permanently on As soon as a MIDI out event occurs the LED turns off for a short time thus indicating MIDI activity Factory setting of the jumpers I
5. pin headers with 16 pins each 16 pin socket connectors female with flat cable can be connected to these pin headers not included with the CTM64 Additionally there is one common pin 11 for all contacts Pay attention that only free contacts can be used This means that the contacts are not allowed to be connected with another electronics or connected with a fixed voltage e g GND The cable length has to be limited to a certain value In accordance to the characteristics of the cable in use Capacitive and inductive effects deform the signal of the pulses that are used to detect a closed or open contact on the common line 11 In this case closed contacts are no longer recognized or accidentally only From our experience cables up to 50 cm do not cause problems For length between 50 cm and 2 m it depends upon the cable characteristics if the CTM64 will work as it should Cables longer than 2 m should be avoided If long cables are essential relays have to be used The relays are located close to the CTM64 and the relay contacts are connected to the CTM64 like normal contacts Please pay attention to the warranty notes on page 1 Ignoring these notes causes warranty loss and the right to return the goods Two different modes are available for the contacts note on off or program change In the note mode closing of a contact generates the corresponding MIDI note on message opening generates note off both without velocity velocity is fixed t
6. tak rd o pon 11 Factory setting t the JUIMPOIS 353355 seca ay A pa 11 Check TE zit A tide AA ae Ss AT 12 Appendix Connection sketch esse eee eee 13 MTGG z sn ri Do bat ine coke kA Ba B E mate ee deh ooo ao o au o pa hana Sah ee SO Ale 14 Additional jumpers for pcb version d sese 15 64 note ONS A PO UA o o ek oo odo barak ou o non 15 Normal toggle Opera cosita a NS nn 16 Control Change Mod isis 16 CIM64 Button Board and Front Panel 0200 tica 17 A A dicots laces kon mi cetacean Done s da ooo niak Sac ooo nose 19 CTM64 Version 4 User s Guide Page 3 Introduction CTM64 is an universal MIDI Out kit Up to 64 free contacts can be connected to generate MIDI note on off or program change messages CTM is suitable to retrofit keyboards switch panels button arrangements or any other contacts so that they are able to transmit MIDI data Up to 4 potentiometers can be connected to generate common MIDI controllers pitch bend and after touch Additionally a 1 4 jack socket is available for connecting a sustain pedal Two different modes are selected with the first of 8 jumpers note on off or program change In the note mode closing of a contact generates the corresponding MIDI note on message opening generates note off both without velocity velocity is fixed to 100 In the program change mode closing of a contact leads to the corresponding MIDI program change message The note offset i e the MIDI note number assigned to the first
7. 8 5 mm and 20 HP width 101 3 mm The front panel is not printed but labels with the numbers 1 64 and 65 128 are delivered The front panel can be mounted e g into one of the frames of the Analog Modular System A 100 even into the A 100 Miniature Case A 100MC CTM64 Button Board 2 SB 3 4 5 6 7 1 8 14 7 19 8 9898999 25 26 27 28 29 30 31 32 BREE eee 33 34 35 36 37 36 39 40 l ee 41 42 43 44 45 46 47 46 Eee eee E 49 50 51 52 53 54 55 56 1 1 II A 57 56 59 60 61 62 63 64 BREE ee eee S p DOEPFE 4 CTM64 Relay Board Another addition to the CTM64 main board is the CTM relay board This boards contains 16 reed relays and allows the control of the CTM64 via a large distance we tested up to 100 m Up to four relay boards can be connected to one CTM64 main board Simple 2 pole wires that have to be shortened at their ends e g by momentary switches are used to control the CTM64 For the CTM64 Relay Board a separate users guide is available a n 8 5 as zu z 25 ee N Bz 38 3 o x zu den 16 Kontakten to 16 contacts to CTM64 main board zur CTM64 Hauptplatine U U U U U U U U U U UU U U U U L o lt o a o u LED Anzeigen CTM64 Version 4 User s Guide Page 19 IU SIK EL EK PAK www doepfer com 2008 by Doepfer Musikelektronik
8. This feature allows the use of foot switches with contacts open at rest as well as those closed at rest The foot switch is not included with the CTM64 and has to be ordered separately if required e g the VFP2 The CTM64 will work without the foot switch although the function Sustain will not be available in that case CTM64 Version 4 User s Guide Page 7 Potentiometer connectors 6 7 8 9 The four 3 pin connectors 6 7 8 9 are used to connect up to four potentiometers rotary potentiometers faders wheels The middle pin of each connector is the slider pin or control voltage pin the left one is GND the right one is 5V As the potentiometers are used as voltage dividers the resistance value of the potentiometer is not critical Any value between about 5kOhm and 250kOhm will work without problems linear response recommended The additionally available CTM64 connector set includes 4 suitable female connectors with assembled cables to connect the potentiometers length about 30cm potentiometers are not included The four connectors are assigned to the following MIDI events e ST1 pitch bend with middle plateau around MIDI data 64 e ST2 modulation MIDI controller 1 s SB volume MIDI controller 7 e ST4 monophonic after touch The actual control voltage range used for ST1 and ST2 is 0 2 5V OV corresponds to MIDI data 0 1 25V corresponds to MIDI data 64 middle position and 2 5V corresponds to MIDI data 127 This vol
9. contact can be set to 0 or 36 with the second jumper With two more jumpers one can transpose up down one octave i e 12 12 semitones Instead of these jumpers a 3 position switch 1 0 1 working as an octave switch can be soldered to the corresponding pins of the jumper pin header In this way the note offsets 0 12 24 36 and 48 are available If another note offset e g 41 is required the contacts are displaced correspondingly and the unused contact terminals are left free In the program change mode the offset can be set to 1 or 64 i e setting the program number range to 1 64 or 65 128 0 63 or 64 127 in MIDI code With two daisy chained CTM64 the whole program number range 1 128 is covered The 4 potentiometer plugs are used to connect up to 4 potentiometers e g rotary slider wheels or others generating the MIDI messages pitch bend modulation controller 1 volume controller 7 and monophonic after touch The 1 4 jack socket can be used to insert a sustain pedal contact type closed at rest is required generating the MIDI sustain message controller 64 The MIDI channel for all messages transmitted by the CTM64 is set with the last 4 jumpers The 64 contacts are connected to four double row pin headers with 16 pins each 16 pin socket connectors female with flat cable can be connected to these pin headers not included with the CTM64 Additionally there is one common pin for all contacts Pay attention that o
10. ctor set for the CTM64 25 00 Euro in Germany i e about 30 00 US This includes four 16 pin flat cables with 16 pin socket connectors female pressed to the cables at one end length about 50cm and four 3 pin female connectors with assembled cables for the potentiometers length about 30cm potentiometers are not included We also offer a suitable power supply mains input 90 240VAC with European type connector output 9V DC 800mA with CE and VDE approval 20 00 Euro in Germany i e about 25 00US Installation of the CTM64 requires some electrical electronical knowledge by the user Please leave the installation of CTM64 to an expert if you are not familiar with electronics We take back only CTM64 modules in the original state i e without solder residues without scratches and so on The counterpart to CTM64 MTC64 that converts 64 succeeding note messages into 64 0 5V signals is planned for early in 2001 With suitable drivers relays lamps or electromagnetic valves can be controlled via MIDI Please pay attention to the warranty notes on page 1 Ignoring these notes causes warranty loss and the right to return the goods CTM64 Version 4 User s Guide Page 5 Connections 11 common connector JP6 1 power supply 7 12V 100mA DC BU3 2 MIDI IN BU1 MABSSH 3 MIDI OUT BU2 BU2 MABSSH 4 control LED D68 12 jumper 1 8 8 JP5 BU4 JACK 35 5 sustain BU4 6 7
11. d34d400 O 4 A E HA U O d LIM lez M BU4 JACKSS5 m O BU2 Bul M BSSH MABISH c cS wii HA CTM64 Contact To Midi Converter Version 4 User s Guide 2008 by Doepfer Musikelektronik 20 10 S IVNI Electrical safety EMC compatibility CTM64 is a so called OEM product OEM original equipment manufacturer that cannot be used independently but has to be combined with additional electrical or electronical equipment to become a working device e g keyboard switches buttons potentiometers power supply case housing The manufacturer of CTM64 does not know the final assembly of the complete device in which the CTM64 is used as a part of the complete device The final responsibility with regard to electrical safety and electromagnetic compatibility is up to the user who is assembling the complete device Please pay attention to the following items The power supply used in combination with the CTM64 has to be a closed type in Germany a power supply with VDE approval is required Normally an AC adapter with plastic case is used It is not allowed to use open power supplies with open mains voltage access e g via mains lead pcb tracks electronic parts On the CTM64 electronics preventing measures against electromagnetic radiation are met RF filters at the power supply input and the MIDI lines But it is impossible to estimate to what extend the components added by the use
12. ding MIDI message is transmitted to MIDI Out pitch bend modulation volume or after touch s if the position of the sustain pedal connected to the jack socket is changed the corresponding MIDI message is transmitted to MIDI Out s if the setting of one of the jumpers 1 8 is changed the corresponding parameter MIDI channel mode offset transpose is changed e ifa MIDI message appears at MIDI In the message is transmitted to MIDI Out and merged with the MIDI data of CTM64 It is possible to use switches or buttons instead of the jumpers 1 8 E g a hexadecimal coded rotary switch can be used to select the MIDI channel or toggle switches can be used as octave switch offset switch or mode switch If note mode is selected one has to pay attention that none of the 64 contacts is closed while MIDI channel or offset transpose is altered In this case the note off event when opening the contact would be transmitted on another MIDI channel or note than the preceding note on event thus leading to suspending notes Detailed function of the 8 jumpers of JP5 Midi channel jumper 1 2 3 4 jumper channel jumper channel jumper channel jumper channel 1 1 1 2 1 E 3 1 4 2 2 2 2 3 3 3 3 4 4 4 4 jumper channel jumper channel jumper channel
13. e CTM64 i e without power supply The CTM64 electronics is an electrostatic sensitive device Avoid any electrostatic charges Avoid short cuts Ignoring any of these items will cause warranty loss Return of the CTM64 within the 2 weeks return time limit valid only in Germany is only possible if all these items have been met Return of used cable sets is not possible page 2 CTM64 Version 4 User s Guide Contents Electrical safety EMG COMPU ia ti A a da 2 Wai n 2 Contents EO O PO O o L 3 Introducir R R O let P P O O E O O O O E ites 4 COMNECHONAS E OA AE E OA A 6 POWER supply R AA A A A cv A ene nee AA A 7 Mid Qut S ii 7 Qs TN La V NE R E O P Pe errr erent pees Wetter P o LN 7 Control LED 4 0ps deje latin so or nde no O ro un 7 Sustain O tade zna dala Bono BOA ath h Ar iaa ooo ono Meh R toler wie gan NG Gan 7 Potentiometer connectors 6 7 8 9 00000nononn non nn 8 Contact 1 64 10 and Common llar 9 SUMP SES 120012 Joe esate soars ooo Ra is TL A ti AOR Eon Eo sacl ce oui DAL Seece cats enhs codes op sobem nn 9 Operation 33 E seek ests usa Sb cade sussssusissvadases TT 10 Detailed function of the 8 jumpers OF JPO 3042x ect weet x nad iaa 10 Midi channel jumper 1 2 3 4 ee eee eee K K K K R O K KKK n 10 Mode jumper 5 JS sedge sal vana ran nuvi certs pon kn 11 Note program offset jumper BI sese eee 11 Octave offset jumper 6 7 working only in note mode l sees essere eee 11 Control LEDs O ooo e
14. ected the closing of a contact causes the transmission of a MIDI program change message on the selected MIDI channel In this mode jumper 8 sets the program change offset to 0 or 64 Using two daisy chained CTM64 with 64 buttons each the complete program number range 0 127 is available It is also possible to use a toggle switch instead of jumper 8 to switch between the program number areas 0 63 and 64 127 The jumpers 6 and 7 have no function in the program change mode Pay attention that there are 2 ways of counting of the program numbers 1 128 or 0 127 If the counting mode 1 128 is used one has to subtract 1 to obtain the corresponding program change number in the counting mode 0 127 It depends upon the manufacturer of a MIDI device synthesizer expander sampler if the counting 1 128 or 0 127 is used CTM64 Version 4 User s Guide Page 9 Operation CTM64 is switched ON by plugging the AC adapter into a wall outlet and connecting it to the appropriate jack 1 on CTM64 pc board There is no separate ON OFF switch After power on the LED on the CTM64 will light up Otherwise the AC adapter used is not suitable has the wrong polarity or does not work Now the CTM64 electronics is permanently checking out the following e if one of the 64 contacts is connected to the common pin JP6 the corresponding MIDI message is transmitted to MIDI Out note or program change s if one of the potentiometers is turned the correspon
15. en mixed up by the user Once again MIDI Out gt MIDI In not MIDI Out gt MIDI Out and not MIDI In gt MIDI In Please use only cables that are suitable for MIDI Are the right MIDI cannels selected same for CTM64 and the device controlled by CTM64 Is the right note range selected page 12 CTM64 Version 4 User s Guide Appendix Connection sketch common lead for all contacts 75u D1 D64 1N4148 l 64 u 00 Ice DA 4094 I I res 17805 E I I I ICZ 4094 C14 E 199n 48 h ICs 4094 m 5 IC5 Er 4094 C13 100n BU1 MABSSH BU2 M BSSH U m S 104 4094 I M M BU4 JACK 35 DOEPFER 5V contact 16 pin female number 5V connectors with pressed 16 pin 2 5V flat cable GND GND potentiometer wiring for potentiometer wiring for ST1 and ST2 ST3 and ST4 resistor values for the potentiometers about 5k 250k linear CTM64 Version 4 User s Guide Page 13 MTC64 The counterpart to CTM64 that converts 64 succeeding note messages into 64 0 5V TTL type signals is called MTC64 MIDI To Contact Gate With suitable drivers it is possible to control relays lamps electromagnets electromagnetic valves motors dimmer packs or switch packs and so on via MIDI The ideal control unit for the MTC64 is the CTM64 Closing a contact connected to CTM64 e g buttons leads to activate the corresponding element e g lamp or electromagnet via MTC64 It is also possible to
16. mmediatly after power on if no closed contacts are connected This may cause problems with Midi devices that have only small Midi input buffers Even computers may have a problem with that and cause an Midi buffer overrun Unused inputs have to be connected to the common lead JP6 Otherwise hanging notes will appear for these terminals CTM64 Version 4 User s Guide Page 15 Another pin header labelled JP8 is located right to the main processor The jumper installed to JP8 has this meaning Normal Toggle operation e Jumper installed in upper position GND towards the XTAL normal mode factory setting e Jumper installed in lower position 5V toggle mode When the toggle mode is selected the CTM64 transmits alternately note on and note off at each closing of the contact opening the contact has no meaning in this mode This can be used to realize a toggle switch e g in Ableton Live Control Change mode When two resistors are installed to JP8 instead of a jumper the control change mode can be selected In this mode the CTM64 transmits Midi control change messages instead of note or program change messages The resistors work as a voltage divider and generate certain voltages that are used by the CTM64 firmware to select the control change mode e 10KOhm from center pin to GND 20kOhm from center pin to 5V Control change mode normal e 10KOhm from center pin to 5V 20kOhm from center pin to GND Control change mode toggle
17. n the factory all jumpers of JP5 are installed This means MIDI channel 1 note mode offset 0 no transpose 12 12 0 The potentiometer connectors ST1 ST4 are equipped with jumpers too so that the inputs are connected to GND i e no function CTM64 Version 4 User s Guide Page 11 Check list In case that your CTM64 installation does not work at the first go please check the following points Is the power supply working correctly After power on the LED has to be on Otherwise the AC adapter used is not suitable has the wrong polarity or does not work The correct polarity is outside ring GND inside lead 7 12V Is the control LED flickering if one of the contacts is closed opened or one of the potentiometers is operated It is very easy to simulate the contacts in the testing state by connecting one end of a wire to the common pin JP6 and touch one or more of the contact pins 1 64 with the other end of the wire The corresponding MIDI note or program changes messages should appear at the MIDI output of the CTM64 and the LED should flicker Is the control LED flickering if incoming MIDI messages appear at the MIDI In of MTC64 this check required only if MIDI In of CTM64 is used Are the MIDI connections between CTM64 and the other MIDI devices installed correctly MIDI Out of CTM64 has to be connected to MIDI In of the MIDI device controlled by CTM64 Especially when computers are used MIDI In and Out are very oft
18. nly free contacts can be used This means that the contacts are not allowed to be connected with another electronics or connected with a fixed voltage e g GND For the potentiometer four male pcb connectors with 3 pins GND slider 5V are available Suitable female connectors with assembled cables can be connected to these pin headers not included with the CTM64 CTM64 is eguipped with MIDI In and MIDI Out The incoming MIDI messages are merged to the data generated by the CTM64 In this way several CTM64 can be linked together e g 3 CTM64 required for 2 keyboards with 61 keys and one basepedal with 32 keys or switch boards with more than 64 switches CTM64 is available only as an assembled and tested pc board The pc board measures are about 90 x 105 mm Four mounting holes with 3 mm diameter are available for mounting the pc board to a suitable base e g with distance sleeves or spacers and screws The configuration of CTM64 i e MIDI channel mode note offset and so on is made by the customer with 8 jumpers as described above page 4 CTM64 Version 4 User s Guide We do not offer a suitable housing as the CTM64 is normally installed into the housing of the keyboard or switch board An external power supply 7 12VDC min 250mA is required It is included with the CTM64 only within Germany In other countries the external power supply has to be ordered additionally by the local dealer if necessary We offer a suitable conne
19. o 127 In the program change mode closing of a contact leads to the corresponding MIDI program change message Jumpers 1 8 12 The CTM64 configuration MIDI channel mode note offset is defined with 8 jumpers The jumpers are put on the double row pin header JP5 The jumpers 1 4 next to the control LED are used to set the MIDI channel Jumper 5 defines the mode note or programm change In note mode the jumper 8 is used to select the note offset i e the MIDI note number assigned to the first contact contact no 1 Two different settings are possible 0 or 36 0 is the lowest note than can be generated with MIDI 36 is the lowest C on a standard 5 octave keyboard Additionally the jumpers 6 and 7 can be used to transpose one octave up or down 12 semi tones Instead of the jumpers 6 and 7 also a toggle switch with middle position 1 0 1 type can be used In this case the terminals of the switch are connected to the corresponding pins of the double row pin header JP5 Consequently the note offsets 0 12 24 36 and 48 are available In case that another note offset is required the contacts are displaced correspondingly and the unused contact terminals are left free If for example a note offset 41 is required the note offset 36 is selected and the terminals 1 5 corresponding to the note numbers 36 40 are left open and the first contact is connected to terminal 6 corresponding to note number 41 When the program change mode is sel
20. r affect the EMC properties of the complete assembly Therefore the complete device has to be shielded against electromagnetic radiation incoming and outgoing These demands are normally met by a closed metal case that covers the complete assembly The metal case should be connected to GND of the CTM64 Warranty e The 64 contact connectors JP1 JP2 JP3 JP4 and the common connector for contacts JP6 are allowed to be connected only to free contacts but not to voltages e Applying any voltage including GND or 5V to the 64 contact connectors JP1 JP2 JP3 JP4 will destroy the circuit e Applying any negative voltage lt OV or positive voltage above 5V gt 5V to the common connector for contacts JP6 will destroy the circuit e Applying any negative voltage lt OV or positive voltage above 5V gt 5V to the potentiometer connectors ST1 ST2 ST3 ST4 will destroy the circuit e Applying any negative voltage lt OV or positive voltage above 5V gt 5V to the sustain socket BU4 will destroy the circuit e Applying any negative voltage lt OV or positive voltage above 5V gt 5V to the jumper pin header JP5 will destroy the circuit e Do not solder directly to any of the pin headers but use female connectors to make the connections between the CTM64 and your application We offer a suitable cable set that contains all required connectors and cables Carry out all connections in the off state of th
21. record the CTM64 MTC64 activities with a computer sequencer so that the complete course of events can be recorded page 14 CTM64 Version 4 User s Guide Additional jumpers for pcb version 4 For version of the CTM64 e few more jumpers are available The sketch below shows the position of these additional jumpers 64 note offset GND normal inverted normal toggle operation operation 5V The pin header JP7 is located near the LED between the MIDI out socket BU2 and the foot switch socket BU4 The upper jumper of JP7 next to the LED is relevant only in the note mode 64 note offset e Jumper installed note offset as described above in this manual factory setting e Jumper removed note offset 64 The jumper has no meaning in the program change mode This new feature was added to cover all 128 MIDI note values 0 127 with two daisy chained CTM64 e g for remote control of certain programs e g for Ableton Live The lower jumper of JP7 has this meaning Normal Inverted operation e Jumper installed normal mode i e closing a contact generates a Midi note on message opening a contact generates a Midi note off messaged factory setting e Jumper removed inverted mode i e closing a contact generates a Midi note off message opening a contact generates a Midi note on application example laser harp with photo diodes or light depending resistors Attention In this mode 64 note on messages are sent i
22. tage range was chosen as in case of wheel potentiometers usually not the whole rotation angle is available but only about 50 If the full voltage range 0 5V would be used the wheels could not cover the complete MIDI data range 0 127 but only a small fraction e g 30 100 If a standard potentiometer with whole rotation angle is used a pre resistor with the same value as the potentiometer should be used see appendix connection sketch for details to obtain a control voltage range of 0 2 5V For pitch bend there is a small plateau around 1 25V MIDI data 64 so that it is easier to find the neutral position of the pitch bender For most of the spring loaded pitch bend wheels this plateau is required as the mechanical neutral position sligthly differs depending on the resetting direction The control voltage range for ST3 and ST4 is 0 5V OV corresponds to MIDI data 0 2 5V corresponds to MIDI data 64 5V corresponds to MIDI data 127 This voltage range was chosen as for these controls usually standard potentiometers with the whole rotation angle are used Unused potentiometer connectors have to be jumpered to GND factory setting Senseless MIDI data will be sent if one of the potentiometer connectors is left open If a potentiometer connector is not used it has to be jumpered to GND i e a jumper has to be installed in the left position in direction to the 1 4 jack socket The resistor values for the potentiometers used should
23. the MIDI OUT jack with MIDI IN of the device s to be controlled i e Expander Sequencer Synthesizer etc or a second CTM64 via a suitable MIDI cable If you want to control more than one MIDI device you have to use daisy chain MIDI THRU MIDI IN connection of the devices ore use a external MIDI THRU BOX Midi In 2 The CTM64 features a MIDI input This input may be connected to another MIDI device The incoming MIDI data are merged to the data generated by the CTM64 At the first place the MIDI input is used for daisy chaining several CTM64 The MIDI input of CTM64 is not suitable for large amounts of MIDI data e g SysEx strings or MIDI messages coming from an computer sequencer as the MIDI in buffer is only 48 bytes In case of large amounts of incoming MIDI messages data loss or delay may occur If the merge feature of the CTM64 is not required the MIDI input may be left open Control LED 4 The LED is used to display any MIDI out activity After power on the LED is permanently on As soon as a MIDI out event occurs the LED turns off for a short time thus indicating MIDI activity Sustain 5 The jack socket is used to connect a foot switch for the MIDI sustain function MIDI controller 64 Do not connect the footswitch unless the CTM64 is switched OFF While power on the CTM64 electronics checks the level of the foot switch and assumes that this level is the off state So do not operate the foot switch while turning power on
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