Skylands Pro Audio offers for sale a Motion Sound Pro-3 Leslie simulator in excellent condition. This unit is is perfect operating and cosmetic condition and was recently completely cleaned and brought to spec by Jay Keiper of Ant Farm Music here in Stroudsburg, PA.
The PRO-3 is a Leslie simulator with a twist; rather than simulate the Leslie rotating speaker's audio characteristics purely electronically, it uses an actual rotating treble horn with a compression driver and a solid state amplifier for frequencies above 700Hz. Frequencies below 700Hz pass through a stereo bass rotor simulator and is made available at 1/4" output jacks for use with a user-supplied amplifier. Though not a rackmountable unit, the PRO-3 is a small, lightweight, and highly portable package. Since the PRO-3 is effectively part Leslie, part Leslie simulator, it can be evaluated with respect to each. When compared to a real Leslie, the PRO-3 is far more portable, needs no maintenance, and when teamed with a good amp it's quite a bit louder than most Leslies.
So what's a PRO-3 sound like? Well, it sounds more like a Leslie than any electronic simulator we know, which of course is no surprise given it's physical properties. To our ears, when mated with a high quality amplifier for the bass rotor simulation, it's comparable to any of the solid state Leslies and better than some of them. It falls a little short of the "gold standard" tube driven screaming Leslie 122/147, but still in all the PRO-3 is a very impressive sounding product.