Vintage Simmons Drums (UK) Users Group

Are these multitriggers sounding like heavy rain on a tin-roof? If it is so: We had a problem like this too (20 Years ago...). It was a capacitor leakage. We hooked an oscilloscope to the supply voltage busses and watched for ripples and ac (Note: If the supply is ok, you see only a straight line). We found them on +15 V power, the spikes occured in the same rhythm as the triggers. It was not one of the big capacitors of the power supply, a 10 mf blocker on one of the voiceboards was the bandit. The search took nearly a day. In your case, the 5V must be working fine, thats the reason why your midi is still ok. Check -15V and +15V for ac, and then check (desolder) every capacitor in the unit hooked up between the supplies and ground. Good luck. 

[Non-text portions of this message have been removed]