KORG X-911 Analog Synthesizer

via this auction

"The X-911 crams a lot of cool features into a small box. It is impressive as an effects processor, a pitch to voltage converter, a guitar synth, or a CV-controlled expander that can be sequenced or played from another synth. You can mix footages and waveforms for some pretty complex timbres. It tracks better than a lot of other guitar synths from the era, but one still has to play the guitar very deliberately and clearly to make it work best.

Here is a video, sequencing an X-911 from Korg's SQ-10 and triggering it with the audio from the KR-55 drummachine. The video shows the X-911's envelope filtering capabilities on the drum machine; it also demonstrates the X-911 as a stand-alone synth module."