Hmmm... this sounds great to me, i've got some reservations about how well it's going to work...

Does the player remember what level it set the volume at, or does it read it back from the kernel/DSP? If you try and change it through the player, it'll bring up the volume display, which would cause problems. (Or... There's a serial command to change the volume. Does it bring up the volume display?)

The seccond problem is GPS lag... The speed is farily acurate, but I don't remember it being too in sync. It seems the main reason you don't notice the volume changing is that it's done exactly as the road noise decreases. I'm playing with the Tahoe with SCV this week again, so perhaps I'll try try and pay more attention to it. From what I've noticed, I keep it on the highest compensation setting, and rarely have to adjust the volume. What we really need is someone to put the HU on a bench with an waveform generator and see how it's responding to the increased speed. (linear, exponential...)

Matthew