OB-Xa MIDIkit User`s Manual
Contents
1. Pin 1 02 gt lt en GND 5v Pin 1 109 262 5262552526565 6 e eee 20020026268 8 117 102 108 TT 103 999 9999 109 9966696596 118 104 ee 111 164 q MIDI OBXa MK MIDI IMPLEMENTATION VERSION 1 2 CHANNEL VOICE MESSAGES STATUS 1000 xxxx 1001 xxxx 1011 xxxx 1100 xxxx 1110 xxxx Data Bytes Okkk kkkk Ovvv vvvv Okkk kkkk Ovvv vvvv Occc cccc Ovvv v000 Onnn nnnn Ovvv vvvv Ovvv vvvv Description Note off Ovvv vvvv note off Note on Ovvv 7FH Control Change Occc cccc Control number e g 01 Mod lever Ovvv vvvv Control value range 0 7FH Program select Onnn nnnn 0 through 77h Pitch Bend change LSB Pitch Bend change MSB CHANNEL MODE MESSAGES 1011 xxxx 0111 1011 SYSTEM MESSAGES 1111 0000 00 00 2Fh 08 pph data F7h All Notes Off The OBXa MK turns off all notes that were turned on by MIDI System Exclusive Encore ID number Device number OBXa MK 08h Command Byte1 See description of command byte Command Byte2 Program number Program Data End of System Exclusive Status Byte Comman2. CHANNEL 2 CHANNEL 3 CHANNEL 4 CHANNEL 5 xOOx CHANNEL 6 CHANNEL 7 xxxO CHANNEL 8 OxxO CHANNEL 9 xOxO CHANNEL 10 OOxO CHANNEL 11 xxOO CHANNEL 12 OxOO CHANNEL 13 xOOO CHANNEL 14 OOOO CHANNEL 15 LEDs on How to Save a Patch via System Exclusive e Select the patch to be saved e Enter MIDI mode e Press PROGRAM 7 The is now ready to dump the current patch Press any of the group buttons to actually dump the selected patch to MIDI How to Save All Patches via System Exclusive e Enter MIDI mode e Press PROGRAM 8 The is now ready to dump all the patches Press any of the group buttons to actually start dumping patches to MIDI How to Load the Factory Sounds e Turn off the OBXa e Press and hold CHORD While holding CHORD turn on the power 5 Expanded Memory The original OBXa had the ability to save 32 patches Later in production Oberheim expanded this to 120 patches With the OBXa MK you can now save 120 patches regardless of the actual production configuration All the patches are accessible from the front panel or by sending MIDI program change commands ranging from 0 to 119 ROM Patches The original late model OBXa came programmed with 104 factory sounds They were supplied on cassette tape but have commonly been lost or damaged We have included this preset data in the OBXa
3. MK They can be loaded into RAM by turning on the OBXa while holding the CHORD button This will erase any previous sounds in those locations MIDI Messages The OBXa MK responds to the following types of messages NOTE ON NOTE OFF PROGRAM CHANGE CONTROL CHANGE PITCH BEND and SYSTEM EXCLUSIVE The follow is a list of the MIDI controllers that the OBXa MK responds to Control Number Function dec hex 1 01h LFO freq depth 05h Portamento time 07h Loudness envelope sustain VCA Sustain 10h Filter cutoff 11h Filter resonance 12h Filter modulation 13h Oscillator Pulse Width 14h VCF Attack 15h VCF Decay 16h VCF Sustain 17h VCF Release 18h VCA Attack 19h VCA Decay 1Ah VCA Sustain 1Bh VCA Release 1Ch Osc Freq 1 1Dh Osc Freq 2 1Eh Osc 2 Detune 102 103 104 105 106 108 109 111 112 113 114 123 40h 50h 51h 52h 53h 55h 56h 57h 58h 59h 5Ah 66h 67h 68h 69h 6Ah 6Ch 6Dh 6Fh 70h 71h 72h 7Bh Sustain Modulation LFO Rate Modulation Pulse Width Depth LFO Mod PW to Osc1 LFO Mod PW to Osc2 LFO routing to Osc1 LFO routing to Osc2 LFO routing to Filter LFO Shape Sine Square S amp H SPLIT DOUBLE UPPER LOWER VCO1 Saw Pulse Balance VCO1 Sync VCO2 Filter Envelope VCO2 Saw Pulse FILTER Osc1 FILTER Osc2 Off 1 2 Full FILTER Noise FILTER 4 Pole FILTER Track Unison All notes off new in 2014 WHAT S NEW cont System Excl
4. OBXa MIDI KIT e User s Manual Encore Electronics 2455 Bates Ave Unit E Concord CA 94520 email support encoreelectronics com website www encoreelectronics com INTRODUCTION Thank you for purchasing an Encore product We hope you are as excited about analog synthesis as we are The OBXa MK allows your Oberheim OBXa to receive MIDI data and perform as a basic MIDI controller In addition to giving your OBXa MIDI capability we have expanded the patch storage from 32 up to 120 giving an earlier OBXa the same capability as a later one If you purchased your OBXa second hand and didn t receive the factory sounds don t worry because we have included them You can load them at any time using a special power on sequence You may then edit them to suit your own tastes One of the most important features of the OBXa MK is the storage of patches and firmware in flash ROM The OBXa MK can now be upgraded with bug fixes and new features using MIDI The patches are also stored in flash ROM and this means no more battery maintenance issues The next section of this manual is a quick reference guide which gives you step by step instructions for performing the new procedures Quick Reference Guide Controls The primary buttons you will use in conjunction with your OBXa MIDI KIT are listed below MANUAL is used to enter MIDI mode PROGRAM BUTTONS are used to select the MIDI function you wish to perform GROUP BUTTONS are used to s
5. d Byte Description pp 00 3 01 02 Request Data from OBXa MK Single Patch Load Edit Buffer Load
6. elect the value of the respective MIDI function How to Enter MIDI Mode Momentarily press the MANUAL button e The MANUAL LED will flash indicating that you are in MIDI mode If you press it for more than 1 2 second you will enter the normal manual mode How to Exit MIDI Mode e Momentarily press the MANUAL button e The MANUAL LED will return to its previous state How to send a MIDI tune request e Press the AUTO button This will tune the OBXa and also send a MIDI tune request for any other synthesizer that can receive the command How to toggle MIDI Program enable e Make sure that you are in MIDI mode e Press the PROGRAM 2 button GROUP LED will be on if the OBXa responds to MIDI program changes Any GROUP button will toggle GROUP A LED When the LED is off the OBXa will ignore program change messages How to Change MIDI Channels e Make sure that you are in MIDI mode e Press the PROGRAM 1 button One or more of the 4 group LEDs will light showing the current MIDI channel Press a combination of GROUP buttons to select a new MIDI channel See the GROUP map on the next page The MIDI channel isn t saved until you exit MIDI mode Quick Reference Guide con Group MAP In the following table an indicates the LED is ON and an X indicates the LED is OFF Group A is on the left and Group D is on the right This table is a binary increment with the LSB on the left Oxxx CHANNEL 1
7. g MIDI controllers They may not behave exactly as you might expect For example when the mod lever is used on the OBXa it only adds the triangle waveshape as a modulation Using the MIDI mod lever the OBXa MK will add whatever LFO waveshape is programmed for the current patch If the LFO is not routed anywhere the MIDI controller won t work On the other hand you can use the square or S H function for a controlled LFO if it s enabled as part of the patch The OBXa MK can also send MIDI note information when you play its keyboard It cannot send pitchbend or modulation because the CPU doesn t have control of them That is a limitation of the original design Also the pitch bend from MIDI is limited to one whole step This is because we had to trick the OBXa into performing pitch bend The built in pitch bender directly modifies the voice cards without CPU intervention The CPU can roughly pitch a voice with one control voltage and then it has to get it really in tune with a fine adjustment control voltage We are controlling these to allow pitch bend from MIDI If the voices are not dead center tuned the pitch bend on some notes may reach the limit before others This has a side effect of possibly detuning a chord Installation Instructions Note Before performing these instructions please read through them once This will help you become familiar with the procedure and possibly prevent mistakes 0 0 Save the patches Unp
8. lug the OBXa from the AC line and any other audio cables Open the OBXa There are a total of 4 screws you must remove 2 on the top left wood edge and 2 on the top right wood edge Mount the three MIDI jacks on the back panel You will need to drill a 5 8 hole for each MIDI jack We recommend using a chassis punch Be sure to check for obstructions wires etc behind the area you are planning to drill Clean all loose metal before continuing on to the next step The flanges of the MIDI jacks should go on the outside of the OBXa to cover any imperfections in the holes Use a 5 64 078 drill bit for the mounting holes The supplied screws should thread into the back panel Remove the microprocessor from its socket It is U101 Remove the following ICs U102 U103 U104 U164 U108 U109 U110 U111 and U117 Note 1 There were several revisions of OBXa CPU board and not all of these ICs are populated in all models Note 2 Early OBXas had a power on mute circuit which utilized part of U117 If after installing this kit you find the output is very quiet bend up pins 3 and 11 so they will not touch anything and re install back in the socket If your U117 was soldered directly into the PCB just cut those two pins so they break connection Remove the 2 screws from the CPU BOARD as shown in Figure 1 Install the two included 1 spacers in the holes where the screws were Plug the 40 pin ribbon cable in socket U101 as shown in Figu
9. re 2 Position the OBXa MK over the two spacers and secure it with the two screws that were removed earlier Solder the eight wires to the 3 MIDI jacks as shown in Figure 2 Close the OBXa and secure the 4 outer screws That s it Figure 1 5 2 e 5 20 a 9s e fa 7 THRU OUT ss Nm Eac mR5 mR8 mR9 p imp Im 6N138 8 e ix em 14 R4 uj 5 7 RE e ee F i rio o N 00 imi mi mounts e e o 6 9o ee e 6850 U6 M e e e ee eee 8 D e e U3 eee mI RI oo es 18 C5 ee e e ee x e e e e e e aood GND 5V 101 2605505562550 056502566605 5 6 109 2606506065205 6555 5 5 2020500260506 5 5 8 5 5 102 108 2005006050255 6 5 5 BS e ees 103 eee 109 104 AAAA 164 Remove these two screws from OBXa CPU board They will be reused once the OBXaMK is in place Figure 2 Inside view of OBXa Backside of jacks z 5020o 5e e e ee THRU OUT psa s ug EZY e n E aR f EY e mounts sf e 01 gle Nis ut
10. usive Commands 00 Single Patch Load FO 00 00 2F 08 00 lt number gt lt patch data gt F7 lt number gt Patch number to load sysex data 01 Request Data FO 00 00 2F 08 01 lt type gt lt number gt F7 lt type gt 00 to request 120 patches 01 to request a single patch 02 to request edit buffer number is patch number when type 01 Nonexistent when type 00 or type 02 NOTE When you request all 120 patches each patch is sent individually in ascending order 02 Edit Buffer Load FO 00 00 2F 08 02 edit buffer data F7 edit buffer data is the same as patch data but it is only placed in the temporary edit buffer It would be a good place for an editor to deposit data while editing instead of writing to flash memory constantly 03 Reserved for firmware updates 04 Save Edit Buffer to Patch FO 00 00 2F 08 04 lt number gt F7 numbers is patch Once you re done editing the edit buffer this will save it permanently to flash memory This is typical for a software editor to perform Universal Device Inquiry message lt FO 7E 7F 06 01 F7 gt OBXaMK responds with FO 7E 7F 06 02 Universal Device Reply 00 00 2F Encore Manufacturer ID 0000 Family ID LSB first 0008 Family Member LSB first 00 01 02 00 Software revision ex 01 20 in 2014 F7 End Of Exclusive The controllers modify the as if you were turning the knobs while in edit mode This is important to remember when usin
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