| Use the preamp in the GT-10B Send/Return loop, and place it next to the GT-10B preamp, and ensure the GT-10B preamp is "off" while you use the external one, because dual preamps in series don't sound so good.
You could probably setup some "Assigns" to toggle between the two preamps, by turning on the S/R loop while turning off the GT-10B preamp with the second Assign.
For typical placement of the External preamp (S/R loop) in the GT-10B internal chain, Modulation effects, compressor, Wah first, then preamp/distortion, then delay based effects after.
But that is a general guide, there really are any fixed rules, just experiment with what works best for you.
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Fender Jazz V and Rick 4001, GT10B/GT100, GR-55, VT-Bass, Marshall bass stack. Free Boss GT and GR55 editor available at fxfloorboard.sourceforge.net
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