All,

I'm using CSoundAV to intercept MIDI input and send adjusted output to 
Overture for MIDI recording.

Because they don't get along well together in real time, I'm thinking, 
run them on separate PCs and link via MIDI.

BUT...one of the PCs (Dell) has on-board sound but no MIDI port. (I may 
have to buy the 2nd PC a sound card, but...read on)

There are many USB-to-MIDI interfaces, with drivers at the USB end.

Is there a USB-to-USB MIDI interface with drivers at BOTH USB ends?

Note: Can't use MIDIOX for this application (thanks for the tip, Art, 
great program) because the MIDI output is dependent not only on the MIDI 
input but on timing between input events (requires variables, timers, 
CSound opcodes).

Thanks,
Barry