I pressed the Phono button to engage the phono preamp on the Aux input...

I pressed the Phono button to engage the phono preamp on the Aux input, but it doesn't turn on.

This is a safety measure on the Monitor Station because the phono preamp adds 32 dB of gain. The geniuses at Presonus didn't want users to accidentally tap that button and blow their speakers. To enable the phono preamp, press and HOLD the Phono button for a few seconds.
*** REMINDER, turn Aux Input level DOWN before enabling Phono. ***

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