via
this auction
"For the serious studio, or serious home use, the rack-mounting PRO-4 can drive up to 10 instruments at once. The PRO-4 has 4 CV & Gate outputs, 8 fully programmable auxiliary CV outputs, 4 LFOs, 8 user memories and includes a polyphonic mode. DCB, KADI, Wasp and MIDI out ports are also fitted as standard, as are DIN Sync 24 and Arpeggio clock outputs. The ultimate analogue synth user's dream machine for just about any situation that might arise.'An excellent buy...if you have more than a couple of vintage synths you can't afford to be without a PRO-4'. Sound On Sound Magazine
Specifications:
Designed to control any type of mono-synth
Switchable for V/oct & HZ/V scaling systems
V-trig (up to 15v) or S-trig (with or without pull-up)
Transpose - up & down 12 semitones
Auxillary CV controllable by any MIDI controller
Programmable LFO - 9 wave shapes inc. random
LFO can be synchronised to MIDI clock
LFO can modulate pitch &/or aux cv
LFO speed is adjustable in real time over MIDI
Selectable note priority -newest/lowest/highest
Old notes are remembered for trill effects
Portamento rate adjustable in real time over MIDI Multiple and single trigger modes
Adjustable pitchbend range
Any MIDI channel can be selected
Set-ups stored in non-volatile memory
MIDI monitor mode - for easy MIDI troubleshooting
Sync 24 & Clock pulse mode
5 Digital Outputs
Parameters can be edited using System Exclusive
MIDI Thru socket"