Most passive basses are equipped with an adjustable, passive low-pass filter (the ToneControl). Rickenbackers have two, one for each pickup. When both PU's are on and using the mono output, both PU's will be subject to both TC's, in parallell? It seems that the only way to get individual adjustment of tone would be to use the stereo output? Am I right? What does the mono output sound like, is it any useful at all?