Control the RK-004 Settings via MIDI
RK-004 MIDI Implementation
The ACI port on the RK-004 allows you to set parameters via an audio signal so you don’t actually need to have a computer around to change it’s settings. However, it’s sort of a fallback. If you are a MIDI crack, there is a complete MIDI System Exclusive set available to change and read the RK-004’s parameters. Below is an explanation of the available commands.
Click here to download the full RK004 manual.
RK-004 MIDI System Exclusive Parameters ----------- SysEx Format: F0 00 21 23 00 04F7 - each command will be acknowledged with a response from the 004. - are 7-bit packed: 7 bytes of 7-bit data is prequelled by a byte containing the MSBs SETPARAM_REQ F0 00 21 23 00 04 03 00 F7 SETPARAM_RSP F0 00 21 23 00 04 43 00 F7 GETPARAM_REQ F0 00 21 23 00 04 04 00 F7 GETPARAM_RSP F0 00 21 23 00 04 43 00 F7 FACTORY_RESET_REQ F0 00 21 23 00 04 05 F7 FACTORY_RESET_RSP F0 00 21 23 00 04 45 F7 COMMIT_PARAMS_REQ F0 00 21 23 00 04 07 F7 COMMIT_PARAMS_RSP F0 00 21 23 00 04 47 F7 PARAMS: --------- NOTE: Params can be set at any time, but are *NOT* stored in internal memory, until 'COMMIT_PARAMS_REQ' has been sent 0 [0x00] SYNCIN_MODE (not used yet) 1 [0x01] SYNCIN_PPSN pulses per sixteenth note for sync-in 4 [0x04] SYNCOUT_MODE sync-out mode: 0=POS_SHORT, 1=NEG_SHORT, 2=POS_LONG, 3=NEG_LONG, >=64:BattSynth 5 [0x05] SYNCOUT_PPSN pulses per sixteenth note for sync-out 8 [0x08] DIN1_MODE 0=SYNCOUT_POS_SHORT 1=SYNCOUT_NEG_SHORT 2=SYNCOUT_POS_LONG 3=SYNCOUT_NEG_LONG 4=MIDI_AUTO 5=MIDI_IN 6=MIDI_OUT 7=UART@38400 (DIN1 only) 8=UART@31250 (DIN1 only) 9 [0x09] DIN2_MODE 10 [0x0A] DIN3_MODE 11 [0x0B] DIN4_MODE 12 [0x0C] DIN5_MODE 13 [0x0D] DIN6_MODE 14 [0x0E] DIN7_MODE 16 [0x10] DIN1_PPSN pulses per sixteenth note 17 [0x11] DIN2_PPSN 18 [0x12] DIN3_PPSN 19 [0x13] DIN4_PPSN 20 [0x14] DIN5_PPSN 21 [0x15] DIN6_PPSN 22 [0x16] DIN7_PPSN EXAMPLE: Set SYNCOUT_PPSN = 6 ( =5, =6) SETPARAM_REQ: F0 00 21 23 00 04 03 00 05 06 F7 \_______________/ | | | | Retrokits | | | +--- paramval RK004 | | +------ paramnr (5) SYNCOUT_PPSN header | +--------- MSBs +------------ CMD = (3) SETPARAM_REQ SETPARAM_RESPONSE: F0 00 21 23 00 04 43 00 05 06 F7 \_______________/ | | | | Retrokits | | | +--- paramval RK004 | | +------ paramnr (5) SYNCOUT_PPSN header | +--------- MSBs +------------ RSP = (43) SETPARAM_RSP FLOW CONTROL -------------- Especially when operating the RK-004 on the full-duplex uart port running at 38400bps, there is a realistic chance of overflowing the connection. Therefore the RK-004 emits XON/XOFF messages in order to flow-control the connection: XON = 0xF9 XOFF = 0xFD Both messages are 'undefined' in MIDI, and therefore are to be used solely for in-band flow-control.
