CAJUN ACCORDION DISCUSSION GROUP
you can sometimes use the C bass button [not the chord] while playing in F, at least the C note is in the chord F [F A C} keep in mind that in the key of F, a typical I-V two chord will switch to C [the V chord]. in that case, your Cs will come off smelling like a rose. but the G, either bass or chord, is going to be pretty far off base [so to speak] wle.