The schematic of DR-110 is:
For this circuit, each percussion element seems to sound when you put a negative pulse of width 1 ms. I’ve put oscilloscope to observe the pulses come as expected.
Here are the pulses to the bass drum and output:
The pulse width looks to be around 1.3 ms.
These are the pulses to the snare drum and output:
For the hand clap, I only took pulses:
This is a simulated output of the bass drum circuit:
The output would be weaker when the pulse is narrower:
A wider pulse gives a stronger output, but the waveform starts distorting significantly at certain point.
