I think I may be onto something.

Seems that what really needs doing on the dsp stuff is to turn the timeout off in coding but I cant verify this since I don't have it.

MUTE_BEI_POLLINGTIMEOUT
aktiviert activated
deaktiviert disabled

So if I am right it needs to be set to deaktiviert

I SOOOO wish I had one to tinker with.

If this works like I think it will it will make the amp come on from the key being on and not look for a signal to stay on.

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Aftermarket E53 Radio Install