Separating LFOs in DOD FX67 Turbo Chorus

[Rodgre]

I picked up a FX67 Turbo Chorus out of curiosity, as some reviews mentioned that it had 2 separate chorus circuits with independent rate and depth. In fact, it does have 2 chorus circuits, but fed by a mixture of 2 LFOs with one chorus' sweep inverted from the other. A great sounding box, but I would really love to mod it so I can use the 2 LFOs independently for each chorus circuit so the right and left outputs would be free to run out of sync with each other.

I imagine this could be a lush sound in stereo, essentially being a different chorus for each channel. It would also be fun to try it out in a static "Leslie" configuration, with a slower rate (bass rotor) in one channel  and a faster vibrato in the other channel.

Here's the schematic. Could someone give me a hand in making sure I know where to make the breaks between the LFOs and if I need any different resistors to couple the individual LFOs to the respective clocks.

http://www.freeinfosociety.com/electronics/schematics/audio/pictures/dodfx67.gif

Roger

[Fender3D]

You should delete the node: U7 pins 5 and 10-470K resistors-560n cap.
then send the CV from each 470K (add another 560n to GND), one to pin 5 and the other to pin 10.
Disconnect the 47n and 100k @ pin 7 and add a 100k from pin 9 to bias voltage @ the 2 33k resistors (basically, make U7c the same as U7b).

This will separate LFOs.
If you need 2 separate channels (high and low), you should add a crossover then feed each delay line with each crossover output.

[Rodgre]

I finally got around to doing this mod and it works! I now have two independent mono choruses fed by the same input signal. It's not quite as glorious sounding as I'd like just yet, as I would love to pull the dry/wet mix a little drier, for a more subtle effect.

It may be an experiment just for my own satisfaction, but if I had a week off to experiment, I'd be tempted to rehouse it, with an effect level trim and an LFO routing matrix to get independent rate, mixed rate (original) both in sync and inverted between the two BBD circuits. With the effect level being able to be 100% wet, I should be able to do "through-zero" effects as well!

Roger