Greetings,
Powering dexter from the Pi's USB power input probably won't change the output volume. (On some of the prototype boards, using the Pi's power jack would eliminate some hum and scratchiness in the audio. The final boards don't have this issue.)
Whenever I've encountered a DL2 cabinet, the beeps always seem too loud to me. That said, it's possible that Dexter's output volume isn't as high, which would make them even louder. Looking at the DL2 schematics, I see that they had planned to have a separate volume control for the beeps, but it was replaced with a fixed resistor on the actual production boards. You can see the space for it on the motherboard right next to the left and right volume controls. It's a shame they left it out.
You could reduce the volume of the beeps by attaching another 10K resistor on top of the fixed 10K resistor that's already there.
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