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I deal with this frequently -- for a specific cap (say 220n or 470n) I'll have on hand only electrolytic which is supposed to be polarized but the PCB/schematic expects a ceramic/film/box cap so polarity is unspecified. I stress out trying to make sure my caps gets installed with the positive...

This trimpot/bias information seems like something that belongs in the build doc ....

FYI, using an A250K as the Volume pot basically solves this.