21st-century overhaul/rewrite for the classic but rare Kawai SX-240 which makes it possible to control the parameters with any MIDI faderbox. Written by Bob Grieb of tauntek.com.
- CC control of SX-240 parameters (upper and lower voices) [CC parameter sheet, PDF]
- MIDI On/Off for lower voices
- Synth remembers the MIDI channel even after switching it off
- Patch and sequence save/restore via MIDI Sysex [Format sheet, PDF]
Note: The code is also available for download via Bob’s page, so you could burn it yourself. When you are buying the firmware chip here, the firmware author gets a share – meaning that you are supporting the work of a brilliant engineer with a true love for vintage synth gear.
The update consists of two 27C256 memory chips programmed with the new firmware. Please take care that each chip goes to the right socket, i.e. “Master” to the Master PROM socket, and “Slave” to the Slave PROM socket.