Drumulator Hum and noise

[Dimensional Space]

This is the one:

http://www.behringer.com/EN/Products/SNR2000.aspx

It's just a noise gate really.  I am sure a cheap Alesis 3630 would do the same thing.
But I like this one because the gate doesn't click open and closed like some units I have tried.   It's nice because it will reduce the hiss and doesn't chew up the original audio signal too badly.  It's very effective. 

[sys700]

I'm hearing the same issue with my Drumulator. Hiss from the main output, hiss from the low tom output. Swapped the SSM2044 filter chips between low and high tom and now it's the hi tom with the hiss, which tells me I need a new SSM2044 for the low tom.

[obsoletemachines]

try the buffer op amps,