| absolutely you can experiment with the rbi in the 4 pro. you can either run it like any other effect before the front of the amp, run it in the effects loop as an effect, or defeat the preamp in the 4 pro by plugging it into only the effect return. if it were me, i'd run it in front of the amp input so you get both at the same time. the 4 pro preamp is way too good to defeat it.
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Ampeg Portaflex Club #1
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