The Pedal Wha works perfectly in the PSR SX900, because it has the VCM (Virtual Circuit Modulation) technology as the Tyros5, PSR S970/975 and SX900, that I know for sure, the PSR S770/775 do not have the VCM Effects, and unfortunately I do not have a PSR SX700 to check if it does....
I have the SX900 and Genos and those two have it...
I am attaching a PSR SX 900 Single registration that I just made for this topic, make sure you connect the Expression pedal in
port # 2
I play the song Sleepwalk with this, as a bonus, I added a delay to it. Santo & Johnny from the late 50s, popular in early 60s
I usually use the Pedal wha for other R & B or West Coast Swing tunes, not on this one, but just to show that it does work.
I usually use at least 4 registrations for a song....Anyway, I hope this answers the question....
I tried to upload the registration file, and only allows bpm, jpeg and others files, but not the rgt file....so, sorry....was not up to me.
Manuel