Check out this DIY analog sequencer in action:

The sequencer is controlling Korg MS10 and Roland S100M synthesizers. The first row controls MS10 pitch and S100M noise-drum gate. The second row controls MS10 filter-cutoff.  Synthesizer sounds are modified live when sequence is running.

The sequencer, called the SEKU, is a two-channel 16-step analog sequencer. Details are available at the Studio Manus site.