I bought my car with a Phaser multimedia deck and the guy had the bi-pass system installed in it. Its a toggle switch bi-pass only thing is i forgot how it goes when im supposed to flip the switch etc. Anyone have any ideas?

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Early '98 A4 2.8 Quattro tip (162,000 miles).
Multimedia-- Jensen Phase Linear UV7i (cd, ipod, dvd). 2 JBL 10" subwoofers, 2 Kennwood amps (800w, 1000w--I don't even use half of it all... pointless.. past owner install).
To be a gentleman these days is hard but someone has to do it.