I just saw this mentioned on my Facebook feed. https://tma-benelux.com/en/product/...apter-module-with-midi-and-trs-inputs-br

[Linked Image from tma-benelux.com]

11-pin universal rotary speaker adapter module, with MIDI and TRS inputs <br>
Originally designed to connect a Mojo Classic to an 11-pin Leslie speaker. But with this ingenious box, you'll be able to connect all kinds of instruments. For example the Wurli sound of a Crumar SEVEN will sound incredible ove a Leslie speaker! Just connect a sustain pedal to control the Rotary effect. Another possibillity, just connect the midi of your keyboard to the Eleven, your modulation wheel will trigger the Rotary effect.

I am wondering if this works my Mojo (which I bought new I think about 4 years ago - and is not the "classic"). Also, I have not been able to find the price yet.