Once the empeg fully shuts down, it won't respond to IR signals. By "fully shuts down", I mean "LED stops blinking" which is configurable somewhere. I forget what the default is; I changed mine to about 5 seconds -- long enough to wake it back up if I want to, otherwise shut down completely. However, if the AC switch is broken, it can cause the player to think that it shouldn't do that.
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Bitt Faulk