It can't be the volume control in this case since the 1V outputs work and the volume setting is stored based on the power source not which outputs you're using (or whether you're actually in the car - my unit thinks it is at home even when it is in the car 'cos it's being powered through the power jack - maybe it thinks I live in an earthquake zone.).

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Mike Crowe
I may not be speaking on behalf of empeg above :-)