unplug all the audio connectors and the usb,
get a pair of headphones with a fat plug that you know to be working (1/8th inch I think) play notes using the midi input or use the SHIFT + SEARCH on the hardware to trigger sounds.
Make sure you have the hardware volume turned up full.
Put the headphones in each of the Outputs 1L then 1R then 2L etc... while triggering sounds.
You should try MULTI MODE and set output to 2LR and 3LR and try them.
See how you go.
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