[sdiy] 4 channel polyphonic midi2cv with trigger

[sbernardi at attbi.com]

I've got an EFM rxcvpro midi2cv, and a PAIA midi2cv. The 
rxcvpro is nice because it is cheap, but it does not 
have a separate trigger output. The PAIA is $99 and can 
do two simultaneous channels with CV, gate, trigger, 
velocity, mod wheel, and aftertouch.
What I would really like is something that could do 4 
channel polyphonic with CV, gate, trigger, and velocity. 
That's 16 outputs - should be possible with a PIC based 
midi2cv? Does anybody know of such an animal that 
doesn't cost $100's?
Lord have mercy - I'm thinking of doing a 4 voice 
polyphonic synth.