Click here for some pics via
this auction.
Note this has the blue pinstripes. There was an earlier version with gray like the
OB-X.
I've heard both that you can and cannot swap OB-SX boards with the OB-Xa. If you know, feel free to comment. The OB-SX was basically a preset OB-Xa with minor editing capabilities. Going left to right you have: Volume (knob), Auto Tune (button), Hold (button), Chord (button), Unison (button), Portamento (knob), LFO Rate (knob), OSC 2 Detune (knob), Filter Frequency (knob), Amp/Filter Attack (knob), Filter Decay (knob), Amplifier Release (knob), Pitch Bend/Mod Lever: OSC 2 Only (Switch), Narrow/Broad (Switch), Up/Down Octave (switch).