This is a first draft of an idea that I have been thinking about for a few months. It’s a Tremolo that pans between the input signal and the signal coming through the FX Loop. If no signal is coming in to the FX Loop it would act as a normal Tremolo. Otherwise it would be cycling from the straight to the effected signal.
The main idea was taking from Nicolas Boscorelli’s Stompboxology Tremolo-Matic X. I make no gaurantees that this actually works as I haven’t built it. This is just a first pass to get the idea down.