I have a few different 4011AE chips I’ve tried and they all output the same. Another quirk is that I’ve had to use lower resistor values for R2,17,32,47 or else the trimpots can’t stop self oscillation with the knobs above 65%.
The signals coming out of the 4011 are 0-5v, which I think is correct since it’s a 5v chip?
I’ve tried a few different triggers and they seem to be enough to get the drums to go. I’ll try some higher voltage triggers and see if that changes anything.