captain russ,
I had a look at the Ketron US site under "accessories", and I saw a volume pedal listed for the MS series that sells for $45.00 Is this the unit you're speaking of? It's not the same pedal pictured in the link I posted from Zzounds.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.