MIDI CV 5 - user manual
Contents
1. pitch portamento is turned on led 0 will be lit Note that pitch portamento time is also defined by note interval Bigger note intervals will make the portamento effect more noticeable e I m changing the filter glide time but I can t hear any changes in the output Solution 1 3 Exit the filter glide time menu by pressing bt 0 and make sure that the filter glide is turned on led 1 will be lit When filter control source is set to control change the filter glide will only be affected by control change messages see midi input Check if this mode is set by confirming that led 2 is turned off in ready mode When filter control source is set to velocity the filter glide will only be affected by note velocity messages see midi input Check if this mode is set by confirming that led 2 is turned on in ready mode Note that filter glide time is also defined by value interval Bigger value intervals make the glide effect more noticeable If your host device has some sort of midi filter make sure it is configured to transmit note and control change midi message types you should consult your host device s user manual in order to do this 172. This happens until all notes are found or until a full voltage sweep is completed frequency Hz 55 0 A1 1 9 G 1 48 9 G 1 46 2 F 1 43 6 F 1 41 2 E1 38 8 D41 7 D1 34 6 C 1 32 7 C1 Voltage 11 operation The following procedures should be followed in order to run the autotuner utility 1 Turn off bypass all modulation sources in the target device example disable pitch modulation filter cuttoff should be set to its maximum value and filter resonance should be set to its minimum so that the signal entering the autotuner input is a basic wave shape square tri etc 2 Set the target device s base pitch to the lowest value that you will want the midi cv to cover 3 the volts octave if available to get a good v oct response 4 Adjust the target device s volume to almost maximum 5 If not connected already connect the main cable CV to the target device 6 Connect the target device s audio signal output to the autotuner signal input 7 Start the autotuner utility by holding bt 3 down for more than 5 seconds The ready led will be turned off and the display leds will display a progress animation If the progress animation is not being displayed it means that the autotuner isn t getting any signal from the target device If this is the case revise and perform the 6 steps described above While the progress animation is running the autotuner is performing the frequency sam
3. pin unconnected If this connection is made under improper conditions both midi cv and target device may be permanently damaged GND Ground connection This is the voltage reference connection pin Without this connection the midi cv WILL NOT WORK make sure you connect this pin to some ground connection in the target device There is one more input in the midi cv that should only be used when the autotuner utility is ran This connection expects an audio signal from the target device For more details see AUTOTUNER UTILITY THE FRONT PANEL INTERFACE midi rx The panel interface is composed by 5 buttons and 6 leds All this elements show different behaviors according to the selected mode or selected menu Each behavior is described in the proper section READY MODE Ready mode is the standard mode in wich midi cv operation is active While in ready mode the device will react to midi messages by outputing control voltages The ready led will be lit indicating that the device is currently performing its main function of converting midi messages into control voltages The midi rx led will blink everytime a midi message is recognized Unrecognized midi messages wont make the led blink see input midi messages for details features pitch portamento when pitch portamento is on the changes in the target device output pitch wont be immediate Instead the pitch will rise or fall progressively until it reaches the most recently
4. result in longer modulation times e To enter this menu hold bt 3 function button down and press bt 1 e To change filter glide time value use bt 1 and bt 2 e To exit this menu press bt 0 READY MODE MIDI CHANNEL EDIT MENU led 0 led 1 led 2 led 3 value bit O value bit 1 value bit 2 value bit 3 bto bt1 bt 2 exit midi channel decrement midi increment midi edt menu channel channel This menu allows you to change midi channel value The midi channel is saved in memory so when the device is turned off and on this value remains the same as the last selection e To enter this menu hold bt 3 function button down and press bt 2 e To change midi channel value use bt 1 and bt 2 e To exit this menu press bt 0 10 MIDI CV UTILITIES AUTOTUNER UTILITY Tunning analog synthesizers can be a hard task to manage Fiddeling with the tune parameters and finding the right combination can get tricky The autotuner provides the possibility to auto tune the target device How it works The midi cv device will start outputting a control voltage that will begin with the lowest possible voltage and slowly increment this value until it reaches the highest possible voltage While this control voltage sweep is operating the midi cv will listen the target device s output in order to read frequency samples and match them with factory preset frequency samples When a match is found the current Control Voltage value is stored in memory
5. you can hold bt 0 and bt 1 and press the reset button The only way to exit this utility is by pressing the reset button FACTORY RESET UTILITY This is a special utility that can be run on power up only It is used to RESTORE ALL CV MEMORY to the factory preset values The user selected channel will also be reset to 1 While in this utility the display leds will display a progress animation After about 12 seconds the utility is over and the device enters ready mode with the factory preset values lodaded into memory In order to enter the factory reset utility hold bt 2 and bt 3 on power up Alternatively you can hold bt 2 and bt 3 and press the reset button ATTENTION while running this utility DON T TURN OFF THE DEVICE and DONT PRESS THE RESET BUTTON 14 INPUT MIDI MESSAGES The midi cv will only react to the following messages midi note on from C1 to G10 on user selected channel midi note off from C1 to G10 on user selected channel control change with control number 0x4A usually used for filter cuttof on user selected channel Technical specifications Supply Voltage 9V DC pitch cv resolution 10 bit pitch cv ripple reduction 56 dB pitch cv range OV 5V filter cv resolution 7 bit filter cv ripple reduction 56 dB filter cv range 0V 5V autotuner frequency sampler range 16 3 Hz C 1 to 12 5 Hz G 10 autotuner frequency sampler resolution 1 8 uS 15 TROUBLESH
6. MIDI CV 5 v1 0 user manual Diogo Moreda 2011 HARDWARE rier ir a A E EES 4 COIN LOVIN eo ita ecu sets ea crt Tae ans E A e E EEEa 4 THE FRONT PANEL INTERFACE oc siicccgaceecaredeciciadescciaasad scsguesteasgand saga eats 5 READY MODE so ssa iea a ai SSS Sie eda 6 BUTTON LED FUNCTIONS IN READY MODE eres 7 READY MODE EDIT MENUS curando padre OO aia ed pad 8 Pitch portamento time edit menu sam vcs sek qb o ES a ea 9 Filter glide time Cd a TA ad dE a 9 Midi channel edit Men sisenes paola nina Sid isa RA aa Lace 10 MIDI CV UTILITIES ss sa Ui E Wate e E id 11 AUTOTUNER UTILITY assessed dances RA e SOL ART a 11 HOW Il WORKS eaii cao hes edna cote ia al PA Gene E ol cao ciel one 11 Operator dd gaia ap nda ada CO Tara Aa Gatos 12 Limitations and stuff to CONSIAEL ee ceeceeeceeeceececeseceseceeeeeeseecsaeceeceeseecaecneeeaaes 13 MONTLOR WNIT Y eisien a aC alae pas an has eigen Sennen aise ts 14 FACTORY RESET UTILITY agia iara aderiu aa Sa a 14 INPUT MIDI MESSAGES ios cies atores porno eae RSS a nd 15 TECHNICAL SPECIFICATIONS cccccssccessssscsscseeesecssetestssnecessssceesceseeseessnsseneenes 15 TROUBLESHOOTING cassia asa paesenis sdact saccade csstale SAAE RSS aa SAS Ca Saia 16 OVERVIEW The midi cv 5 or simply midi cv is a midi message interpreter and voltage control generator It is designed to control 5V synthesizers midi message 5 midi cv gt control voltage There are 2 CV outputs
7. OOTING Problem e I send midi commands to the midi cv but it wont react and the midi rx led does not blink Solution 1 Make sure that the ready led in the midi cv is lit 2 Check your midi connection from the midi cv to the host device the device that is sending midi messages to the midi cv 3 check your cv connection from the midi cv to the target device see hardware chapter for connection details 4 Make sure your host device is on the same midi channel as the midi cv see channel menu for details on how to change the midi cv midi channel 5 If your host device has some sort of midi filter make sure it is configured to transmit note and control change midi message types you should consult your host device user manual in order to do this Problem e I send midi commands to the midi cv but it wont react although the midi rx led does blink Solution 1 check your cv connection from the midi cv to the target device see hardware chapter for connection details 2 check if the target device is turned on and if it runs on batteries check its battery life 3 Check if the audio output of the target device is connected to an amplifier or any other audio driver device 4 check the volume of the target and driver devices Problem e I m changing the pitch portamento time but I can t hear any changes in the output Solution 16 Problem Exit the pitch portamento menu by pressing bt 0 and make sure that the
8. available One is intended for pitch voltage control and we will call it pitch cv The other is intended for filter control voltage or any other modulation target but for simplicity we ll call it filter cv The two outputs have different characteristics Normal operation does not predict the usage of the pitch cv to control the filter and vice versa The filter cv is generated trough direct value conversion of control change or note velocity midi data The pitch cv is generated trough a memory table that stores voltage values Well call it cv memory This memory slots are read and applied to the cv output according to the midi note pitch value received The midi note range interpreted by this device goes from C 1 to G 10 wich gives a total of 116 possible notes The cv memory can be changed and restored by using the autotuner and the factory reset utilities details can be found further ahead The normal state of this device is the ready mode While in this mode the device performs its main function wich is convert midi messages into control voltages This mode is turned off when the user runs one of the device s utilities HARDWARE CONNECTIONS In order to use the midi cv you will need a midi host device and a target device The following diagram displays how the midi cv should be connected to the host and target device for basic functioning HOST DEVICE MIDI CV TARGET DEVICE midi out midi in cv out cv i
9. ch filter glide cc vel portamento on off modulation on off source bto bt1 bt2 bt 3 toggle toggle toggie function pitch portamento filter glide between cc and enter autotuner on off on off vel mod source mode bt 0 pitch portamento on off led 0 when pitch portamento is on the led is lit when pitch portamento is off the led is off bt 1 toggle filter glide on off led 1 when filter glide is on the led is lit when glide is off the led is off bt 2 toggle between filter Control Change Velocity control source led 2 when filter Control Change source is active the led is off filter control Velocity source is active the led is on bt 3 function autotuner button see edit menus and autotuner mode led 3 unused READY MODE EDIT MENUS While in READY MODE it is possible to enter menus to make changes to the device operation parameters in real time such as midi portamento time filter glide time midi channel Menus are simply a special mode where you can edit a value like edit the value of the pitch portamento The midi cv conversion operation is not interrupted when you enter a menu this way you can change a value and instantly listen the result While inside a menu all buttons and leds acquire different behaviors than those explained for the READY MODE bt 0 exit current menu bt 1 decrement current menu value bt 2 increment current menu value bt 3 unused The fou
10. n audio output MM The host will be the device that will generate midi messages usually a midi keyboard a sequencer or a computer and pass them to the midi cv You should connect a midi cable from the host device s midi output to the midi cv midi input The target is the device that will receive the control voltages from the midi cv and will generate sound This should be some kind of analog synthesizer The cv output on the midi cv should be connected to the target device cv input Here is a diagram of cv connector on the midi cv Note the connections from left to right pitch cv pitch control voltage output This is the voltage that will control the pitch that is outputted by the target device gate gate signal output This is used as a signal that tells the target device that a note is being pressed Note the midi cv does not generate a trigger signal filter cv filter control voltage output This is used to control the target device s filter cuttoff or any other modulated target on this device 5V If you want you can power your target device by connecting this output to the target device s V input IMPORTANT Note that the voltage supplied is 5 Volts only You should never make this connection without first checking you re target device s operation manual for its power specifications Very few synthesizers are designed to operate at 5 V if you re not sure of what you are doing it is better to leave this
11. ng the target device s base pitch and run the autotuner again When the voltage range of the midi cv is lower than the target device s control voltage range the autotuner wont be able to cover the whole pitch range of the target device As a result all notes below the target device s base pitch will output a frequency equal to the target device s base pitch and all notes above the midi cv control voltage range will output a frequency equal to the target device s base frequency added with 5 volts of control voltage A solution to this problem may pass by adjusting the Volts per Octave parameter in the target device if available and run the autotuner again 13 MONITOR UTILITY This is a special utility that can be run on power up only This is a test utility that will initiate a sequence of tones comming out of the target device This tones are the result of the midi cv outputting the control voltage values stored in memory one by one The first Control Voltage will represent the value stored for the note C 1 the last will represent the note G10 The 116 slots of memory will make the midi cv output 116 tones While the monitor utility is running the ready led and midi rx led will be off The display leds will display a running 4 bit counter This utility takes about 36 seconds Once the utility is finished the device enters ready mode In order to enter the monitor mode hold bt 0 and bt 1 on power up Alternatively
12. pling operation described in How it Works Everytime a match is found the midi rx led blinks When the autotuner sequence is finished the midi cv will return to its ready mode operation and the ready led will be lit once again This utility can take a while until is finished 4 minutes You should test the autotuner result by playing some notes Tip Choose a note and play all its octaves this makes it easier to notice pitch drifts If you are not satisfied with the result you can run the autotuner again or you can restore factory preset values see restore factory preset values The only way of exiting the autotuner utility is to press the reset button altough this should be used only when the autotuner seems to be stuck otherwise this button shouldnt ever be used in this utility 12 Limitations and stuff to consider The frequency sampling detection range of the autotuner goes from 16 3 Hz C 1 to 12 5 Hz G 10 The control voltage range of the autotuner is the same as the midi cv range wich goes from 0 V to 5V The pitch CV resolution step is 0 000453 V When the target device s base pitch is set too high above the lowest frequency sampling detection value all the notes played bellow that pitch value will output the same pitch equal to the base pitch set in the target device You will probably notice that when the autotuner is started and the midi rx led starts blinking a lot This can be resolved by loweri
13. r leds led 0 led 3 will display 1 of 16 different combinations to display 1 of 16 possible values The value displayed is the current value for the current selected menu The displayed values are like 4 bit binary values arranged in an inverse order o E 00 O READY MODE PITCH PORTAMENTO TIME EDIT MENU led 0 led 1 led 2 led 3 value tet O value bit 1 value bit 2 value bit 3 bt oO bt 1 bt2 exit pitch decrement pitch increment pitch portamento time portamento time portamento time edt menu This menu allows you to change the pitch portamento time value Bigger values make longer pitch portamento modulation time This value ranges from 1 to 16 Mind that pitch portamento modulation time also depends of the note interval Bigger note intervals will result in longer modulation times e To enter this menu hold bt 3 function button down and press bt 0 e To change pitch portamento time value use bt 1 and bt 2 e To exit this menu press bt 0 READY MODE FILTER GLIDE TIME EDIT MENU led 0 led 1 led 2 led 3 value tet O value bit 1 value bit 2 value bit 3 bto bt 1 bt2 exit filter gide decrement filter increment filter time edit menu glide time gide time This menu allows you to change the filter glide time value Bigger values make longer modulation times This value ranges from 1 to 16 Mind that filter glide modulation time also depends of the modulation value interval Bigger intervals will
14. received pitch value The time of this progress depends on the note interval and on the value set in the pitch portamento time edit menu higher value means more time A simple button will toggle this feature on or off and a led will indicate if the feature is currently active filter glide when filter glide is on the changes in the target device output filter cuttof or any other modulation target wont be immediate Instead the modulation value will rise or fall progressively until it reaches the most recently received modulation value The time of this progress depends on the modulation value interval and on the value set in the filter glide time edit menu higher value means more time This works in control change and velocity control source modes A simple button will toggle this feature on or off and a led will indicate if the feature is currently active filter control source The filter cuttoff or any other modulation target can be controlled from either control change or note velocity midi messages A simple button will toggle between this two sources and a led will indicate wich source is currently active midi channel selection The user may select one midi channel This is the channel of midi information that the device will monitor and react to Any midi message coming from a different channel than the selected one will be ignored Global mode is not supported button led functions in READY MODE led o led 1 led 2 pit
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