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PA plug-in ???

You could possibly use the headphones out to go to the PA (assuming your PA has 1/4" line inserts) with a TRS cable. Keep the volume on your amp low in order to not overdrive the PA input.

Note that using the headphone out will kill the output to the internal speaker of the Rumble.

The more straightforward thing to do is buy a DI box and use that between your bass and amp with the balanced output going to the PA.