The first thing is to verify the pot you are using has the correct taper... there are several types and the nomenclature is NOT too consistent. The second thing is to measure the voltage out of the pot to make sure it covers the range between the outside terminals. After that measure the voltage across the pot... I suspect it might be 5 volts... if you find it way below that, that would certainly be the problem. Note: I do not have schematics for this product and my comments here are based upon my engineering experience and how this sytem is likely to work. The MIDI convertor MAY use a PIC processor or similar.
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