The Korg ER-1 is an analog modeling rhythm synthesizer with a step-sequencer built-in to drive the 4 analog voices as well as the sample-based percussion parts. The sound is something you could liken to early Kraftwerk and perhaps a bit like the TR-808 (although the individual voices sound more simple than those of the 808).  If the built-in sounds aren’t your cup of tea it has midi out so you can drive a sampler/rack unit/anything MIDI with the rather fantastic Electribe step sequencer.

(An original photo taken by Jordan Passmore @jordanssynths.tumblr)