I use a yamaha MO-8 keyboard. I want to be able to switch between voices using my foot because I can't physically move fast enough with my hands to hit the button on the right. I also want to be able to continue using the sustain pedal. For a specific example, I want to switch between the E. Piano 1 sound and the Bright Clav sound back and forth using just one pedal without programming a set tempo and number of measures into a performance. Just push the pedal, and the keyboard alternates between the two voices I want. Can this be done with this keyboard? If not, what keyboard can do it?
We moved your post to Legacy forum as it is not a MOXF.
Can this be done with this keyboard? If not, what keyboard can do it?
No, it can't, sorry.
The updated MOXF (the grand child of your MO) can toggle between sounds that you program using its XA CONTROL feature. Originally programmed to a button, but the button can be operated by a foot switch. XA is Expanded Articulation, which allows the performer to activate and deactive Elements when you desire, this is completely "invisible" sonically and allows for smooth transitions between sounding Elements, even if they are in different programs.
The newly released Montage allows you to switch back and forth between sounds using a newly implemented morphing feature via its SuperKnob, which can be operated by a Foot Pedal. The very first sound switches between an acoustic piano and an electric piano, but any sounds can be programmed for this purpose.