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Hi,
I think I found the way to control the delay time of the EX800 chorus.
I removed resistors R67 & R68 and replaced them with a potentiometer wired as a voltage divider between D+ and D-.
My scope shows that the pot changes the frequency of the voltage going into the MN3012 clock.
I placed a 10K resistor between D+ and the pot, as any resistance below about 10K stalls the chorus.
Izhar