Kenton Pro-2 dual midi CV converter

via this auction

"The Pro-2's converter has two completely independent sections, A and B - these can control two separate synths on independent MIDI channels. Apart from basic Gate and CV (pitch) outputs, each section has two additional CV 'Aux' outputs; a common use is one for Filter Cutoff and one for Amplitude, although if your analogue synth is flexible enough they can control anything. Each section also has S-Trig outputs for you Moog owners :-)

Usefully, the CV outs can be scaled to allow for out-of-tune analogue synths.

Also present is:

DIN sync output allowing you to sync up midi clock to old-school stuff like the Roland TR-808,TR-606,TB-303. Midi In,Out and Thru.

Arpeggiator out - a simple clock out to sync up your synth's arpeggiator (Juno 6, etc?) - you can change the clock divide to suit.

Also, and very rarely, this Pro-2 has a Kenton KADI output fitted and includes the super-rare lead too! To be honest I've never used the KADI output but I understand Kenton (and others?) can fit KADI inputs to drum machines like the TR-808, TR-606 and CR-78 - using this KADI equipped Pro-2 would allow you to play and program the (eg) TR-808's drum sounds from a midi keyboard.

I have successfully used this Pro-2 with an Arp 2600, Odyssey, Minimoog, Jupiter 4, Jupiter 8, CR-78, etc."