Triggering MIDI Instrument-Simultaneously Recording Audio

I would like to use Cubase LE4 to trigger via MIDI my Roland TR-707 drum machine. I would also like to simultaneously record the audio output of the 707 back into Cubase. Please advise as to how to do this. I have not seen anything in the forums about MIDI triggering drum machines and simultaneously recording the audio output. Thanks

MIDI cables to and from interface, MIDI track set up. Audio cables from drum machine to interface, audio track set up to record source. External sync set up if desired.

Connect your TR 707´s audio outs to your soundcard´s audio ins, connect your Midi interface´s Midi outs to the TR 707´s MIDI in - record enable audio track, press record (given your Cubase settings are correct - this is explained in the manual.)