Mono Stereo

How can I make a stereo output for my mono electric keyboard?
I have a Fender Rhodes Stage 73 electric keyboard with a mono output. I’ve seen other versions of Rhodes keyboards that have stereo outputs that allow for things like tremolo or various panning techniques. How can I make an external patch/box that will allow for this? Not just a Y splitter, but something that allows for panning, tremolo, etc.
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mono stereo – on and on












