Imagine a sound signal connected to the wiper of a pot, the ends of which are connected to two speakers. By turning the pot, the sound will fade from one speaker to the other.
How can I do the same thing electronically, using an Arduino to control how much sound goes to each speaker? PWM will probably interfere with the sound quality.
Are there such things as digitally controlled audio amplifier chips? I couldn't find any on the Farnell (Element 14) site.