Awesome.

It seems like there was some solution somewhere to the data being spewed out on the serial port. But I forget if the in-car serial port is the same as the back-of-the-empeg serial port, and, if it is, there's no way to prevent it from doing so. But you could put in a timed circuit so that the serial port isn't connected for, say, 15 seconds after the empeg powers on.

Someone else who's more familiar with the serial port hardware chime in.
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Bitt Faulk