> 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.