OP

Quoted from herg:

The TRIACs are going to be controlled based on the zero crossing, but the power from the GI OCD will be running at a totally different frequency. You could set the OCD to feed it solid DC by setting the duty to 100%, but the the TRIACs would not turn off.

OP

Quoted from herg:

Bill,
It's the other way around, but yes, I could guarantee that the solid wires are ground (switched through MOSFETs) and the white striped ones are ~9V DC. If you'd like to see a schematic, just let me know, and I'll email it to you.
All the OCD would be able to do in this case is to provide the chase light board with a DC input rather than the AC that it normally gets. The control portion of it, and as a result, the smoothness of how the chase lamps would turn on/off, however would have to remain on your board (the Chase Light II). Since there are two solenoid drivers that are used to sequence through the lamps, you'd have to use those to figure out when each set of chase lights was turning on/off and ramp the duty cycle of the GI power that is being routed out to the chase lights.
I'm really not familiar with how those solenoid (DRIVE1 and DRIVE2) signals are being used, so I can't really even make an accurate guess as to whether they would work at all with the current design and a pulsed DC input. If they change very slowly, and the control line going to the TRIACs remains high for multiple seconds, it might work pretty much as intended except that the turn on/off would still be abrupt as LEDs typically are. If you set the OCD to 100% duty, providing steady DC in place the old AC, I think the TRIACs would remain locked on.