No, that one is the low C key (lower key of the right pinky keys). Paul Maslin, whose shop did a complete overhaul of this one (before I even thought of getting my hands dirty with sax repairs) told me that they literally adjusted each key individually until it played in tune with their own c-sop MPC. I have to take that at face value but the only consistencies are the main upper and main lower stack, everything else is either more or else less than what I had expected. Paul also told me that the c-sops are the most difficult horns to set up correctly and I tend to believe him with what I know now.
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