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Messages - Axldeziak

#1
I have seen mention that Behringer uses the Cool Audio V2902 for it's USB codec. It's a clone of the Burr-Brown TI PCM2902. Try looking at Figure 39. Bus-Powered Configuration on the PCM2902 data sheet for some clues.
#2
I think it does mean 500 ohm. I took a minute to look at other dean markley schematics, such as the k-30, k-65 and they all had the same oddball A500 pot listed.
#3
Try adjusting your search terms. Using quotation marks " around what your looking for will limit the search to that exact term, "500 ohm". As well using a - before terms you don't want will eliminate them from the search. For example -500k -trimmer -linear ect. You can use - multiple times in a search to eliminate many items at once.
Using that method I found five different 500 ohm log pots.

You could also try getting a dual 1k pot and putting it in parallel with itself to half the value to 500ohm. Or using a linear with resistors to mimic a log pot. https://www.diystompboxes.com/analogalchemy/emh/emh.html