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B-15/ line-level effects

It would take some modding. The "Ext Amp" jack is a usable fx loop send, but there is no loop return--so you'd have to make one. Easiest thing would probably be to find the point where the preamp stage connects to the power amp stage, and just interrupt it with a TRS jack. Then use an insert cable (TRS Y'ed to two TS) to/from the effects.