Doepfer

> The MFB triggers the AS drums, but only the trig led lights up and there's no sound.


More than likely, this isn't a problem with the back of the modules, but the front.  To properly, audibly trigger the Analogue Solutions Concussor modules, you need to give them more than +5V as a trigger input.  I'm not familiar with the MFB drum sequencer.  If it has the ability to output a higher voltage, say +10V, that should do it.  Is there a jumper for that?  If not, you may need to buy a few A-183-3 modules.

This advice is given without warranty, but is based on my experience with the BD-88 and SD-88 Analogue Solutions modules.  I believe they're heavily based on the TR-808, which wasn't using TTL standard voltages.

Hope that helps,
Zoë.