I have my second Mk2a attached to my main stereo receiver.
(Something similar to the way that your Mk1 is attached, I imagine.)
I want to be able to leave this Mk2a in standby, so that if I need to run emplode
I don't have to have that receiver powered.
Whenever that receiver is switched on, I would like this Mk2a to start playing (if it's not being emploded at the time).
And when that receiver is switched off; to return to standby.
That's all.
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Really it could be one of the other inputs, I suppose.
I guess, that I got caught up the way the ignition sense input functions in the automobile.
Joe Mumme