I can't remember where I read it now, but somewhere, Hyperion stated that the on-board audio chip is rather limited and is not supported. A separate sound card (SB Live! is recommended) is required. Support for the SB Live! is supplied with AOS4.
So the AMR is of no use to you unless you DIY.
On the subject of G3 Vs G4, the Motorola site has a pdf that tries to convince you to throw out your G3 and plug in a G4. It claims that the sustained data transfer rate of a G4 is about 2.5x the speed of a G3, using a 100 or 133 MHz bus. It achieves this by more intelligent cache controls.
tony
