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Thread DX7 Pitch Trouble?!

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1 DX7 Pitch Trouble?!
I've used this DX7 for years and have never had this problem. every key is a half-step lower in pitch than it should be. this is true for all internal voices. I used "voice init" to try and build a voice from scratch but even this pure tone's middle C is equal in pitch to a B. This must mean that the assigned frequency for middle C is somehow no longer the intended 262Hz, but I can't figure out how to change this. A temporary solution is to use key transpose to assign C sharp as the new middle C, but I'd prefer a better fix. The coarse and fine frequency adjustment for the operators are as they should be, with coarse at 1.00 and fine at 0.00. the only difference in my setup between the times I played it in the past and now is that I connected a yamaha C7 volume pedal to the DX7 volume modulation jack, but I don't see how this could've messed up the keyboard's pitch. please help!