CV-GATE/MIDI this converter is the most comprehensive on the market to my knowledge.
It can simultaneously control 5 synthesizers CV-GATE  (2 + 6 main controllers to fully customizable), either V / Hz or October / volt, plus a clock for an arpeggiator for example, and an optional additional port ( KADI) to control a 808, 606, an EDP Wasp, etc ...
There are also 2 more LFO waveforms, portamento, etc, etc, ...
I use it with my 808 and the appropriate kit, an MS20, CS15, SH101, System 100, and everything runs smoothly.

UTILIZATION

Using ultra simple, menu defillant.
Manual in hand, after an hour it was all inclusive.
Several configs are stored.

OVERALL OPINION

For nearly three years this material has never been lacking.
What you should remember is that it is quickly "forget", leaving more time for more important things, like making music.