Well, with those two modules, you will have an arm and a leg of a drummer. So that is allready a half drummer :)
-- M01C

Just an update:

I managed to get sorted bring the individual audio outs of my drum machine in to my case by using x2 Erica Synths Links

http://www.modulargrid.net/e/erica-synths-link

It's meant to take a Modular level 3.5mm connection DOWN to Line level 1/4" Jack but.... it also takes a 1/4" Line level and bumps it up to Modular level with a 3.5mm output. In other words it works in both directions so two of them give me 8 channels in and out.

£49.99 each at Signal Sounds, perfect for getting my external gear in to the case.