== Mono and Stereo Output ==
When using the CPC's external stereo jack, the stereo output causes channel A is output of the PSG to be heard on the rightleft, channel C is output left, to be heard on the right and channel B is output to both left and right, be heard in the middle. [http://winape.net/help/sound.html Source] In that case , channel B is output through a bigger resistor to prevent that this channel appears louder than the others.
Otherwise (when using the built-in speaker), all three channels are mixed at the same intensity. This signal appears to be also sent to the Tape output line also, so a connected Data Recorder could be used to record CPC music also.