I am surprised nobody has mentioned the foot switch up to now, also applies to the registration topic earlier.
I use it all the time for registration changes.
OOPS!! off topic.

Ray

Yes...I know about all the things you can do with the foot pedals...AND IF you have a Genos and a MIDI foot controller you have lots of foot switches AND foot pedals if wanted.
In fact my Yamaha HS series organs had a foot sw on the left and right of the expression pedal for assignable use as well....cool! Oh and of course a knee lever to use for stuff as well.... 16 pistons for Registration changes also were great (yes I said 16).....Those were great instruments....
If you cound take a Genos and a HS series organ and marry them together...WOW what an instrument it would be.

Lee