Until recently I was running the right output of my PX-5S though a Neo Ventilator II so I could have split settings with mono piano on the left and B3 on the right, This sounded great, and there doesn't seem to be any loss of tone when running piano though the Vent in bypass mode. I decided I wanted stereo piano and organ available at all times, so I've now bought a Yamaha Reface YC: 37 mini-keys with excellent Hammond/Vox/Farfisa/etc tones and nine drawbars. The Reface YC's Leslie emulation is decent enough (better than the PX-5S) that I can leave the Vent home for casual gigs. Also, the Reface YC sits quite nicely on the right side of my PX-5S over the battery compartment, so I don't need a double tier stand.