You can use any midi bass pedals you want with the Ketron Midjay. Ketron also makes a Volumne pedal that has 4 switches in each corner of the pedal. You play the root of the chord with the midi pedal and make the minor chord by using your toe or heal .
You could possibly use the midi bass pedals and also use a Ketron FS6 or FS13 footswitch vs. the volumne pedal.
Dan O
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Ketron, Yamaha, Casio,Korg
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