By sheer coincidence the TR-33 and MR10 share the same length - and with the TR-33's big plate with lots of space on top, it is just asking to have the MR10 mounted there. It even had space enough for a breakout box on top of that as well! So the MR10 and the TR-33 got merged into one - with the unipulse feeding them both! (i used 15 of the 16 triggers of the unipulse, so there is room for a tiny expansion)
I only seem to have one weird bug at the moment. It answers to midi from ableton, which goes thru my mpc 2000xl into unipulses midi socket. Works like a charm! However, when i try to sequence the unipulse from the mpc, the unipulse reacts very rarely - and the mpc sequences all my other hardware with no problems! ... Will try some more testing, but seems like a weird problem.. Have any suggestions?
ROLAND TR-33:
You access the voice generator board by unscrewing the panel on the back. The trigger points are located at different points on the edge of the board, they are all marked with letters - S (snare), BD (bass drum) and so on (You can look up the rest in the service manual, i attached to this post). We found 8 different trigger points for the sounds in the machine. Maracas and High Hat share the same trigger point because they are sharing the same path of synthesis (has probably been sent different pulses to change the characteristics of the sound) - the same with Rim shot and cowbell.
If you want to do further modding on the TR-33, the service manual provides rich details on working with decay, pitch and other things - all the mods we did are described in the service manual. We had to detach a few wires, prolong them and solder them back on, so that we could flip the board and gain access to the backside. For most of the mods, we put potentiometers on to the existing variable resistors, so that they work in parallel (except for the bass drum, where we detached a fixed resistor and replaced it with a potentiometer) - works well, but it should be considered desoldering the variable resistors and replacing them entirely with you’re own potentiometers.
