Your problem has been haunting musicians since at least 1983. There is no standardization for labeling MIDI Program Changes. I suspect that your controller manufacturer chose PC 1-128. MicroPitch receives PC 1-127. [That would be a PC=0-127 ‘standard’, and I’ll speculate that PC=0 brings up the ‘edit buffer’: the currently loaded preset that you can adjust with the front panel].
Not much you can do about that easily, beyond the mental math. There are hardware & software options to do the ‘off by one’ conversions. You may run into the same lack of standardization for MIDI Channels [0-15, or 1 through 16]. And don’t get me started on where middle C is on the MIDI Note range [at least 3 different conventions].
Bottom Line: There are standard ranges of MIDI PCs, MIDI Channels, and MIDI Notes. Byte-wise, they are identical. But how each manufacturer chooses to label them can be different.
