Somehow I missed in my last post that there is independent velocity for each drum sound in the TR9090. From the manual:
†The 9090 has a complete MIDI interface. Drum sounds are assigned to individual keys and are
velocity sensitive. The interface, located on Board 2, is implemented with a 4MHz PIC 16F84
microcontroller. A number of latches, a discrete 6-bit DAC and demultiplexers provide separate
trigger and velocity signals for all drums.â€
What is more interesting for this sequencer project is this post from Trevor I remember I read in the TR9090 Yahoo group:
†The spare connectors adjacent to the PIC were originally intended for a
sequencer board to plug into the main boards, but sadly my sequencer
board never became reality.
However... Those connectors may still be useful to someone, because they
provide access to the DAC, multiplexers and trigger latches (full
control of the 9090 by means of parallel data). â€
Best regards
Magnus