A little known feature in Structure is the ability to load custom impulse responses (IR) into the convolution reverb effect. Now, many might automatically think of using IR from sexy reverbs like Lexicons or plates, but an equally awesome use is loading in amp IR for guitar and bass sounds.
Load any convolution reverb from the Structure presets after the sound parts (but before the effects), then click on the ‘…’ option in the bottom right of the Effect Editor to select a new IR.
There are a multitude of sites with excellent free impulse responses.