Fairlight CMI Voicetracker VT-5 Pitch to MIDI CV Synth

via this auction

"Best for vocal or guitar signals (not so good at tracking low bass but you can make the synth you're controlling go as low as you like with the inbuilt octave up-down function). If you have an analog synth such as a korg MS-10 or MS-20 or another modular or synth with many control inputs you can control the Pitch, Gate, Volume, Brightness (VCF cut-off frequency) and Purity (noise level?) and all simultaneously!"

You can find more details on the VT-5 on The Holmes Page here.