A good idea Affectionate-Bee-781, i wouldn’t have thought of that, using the inputs and outputs on the Anyma Phi in FX mode, plugged into the FX Loop section of the ET-5. It just might fit up there with it’s controls, and there is certainly a wide range of FX available with it.
Perhaps even more apropos would be to use the Les diffYUseurs effects emulator that Yves Usson created. That’s a digital FX processor made to simulate the original Ondes Diffuseurs loudspeakers that were used with the original Ondes Martenot. I wrote about the Les diffYUseurs over in this thread. I really like its sound, and short of getting re-creations of the Ondes Diffuseurs, it would be a natural combination.