Yamaha DTXpress/DTXplorer/DTXtreme

Jeff,

If it is the speed of the pulse then you need to try adding some
capacitance to the output (transistor collector).  If the rock band
input impedance is 10k ohms then something like 1uF on the output
(collector) to ground is worth a try.  It is a bit of guesswork but
100nF to 10uF is the likely range that would work.  Too high and it
will stop working altogether (the capacitor will stop the output being
pulled down).  Too low and it will have no effect.

Keith.