Because the Flextone doesn’t have as much raw processing power as the AxSys/AX2, it cannot run all of the different effects at the same time. You’re limited to only one of the selections on the Effect Select knob per patch (Reverb is always available, though). If a
patch is saved with, say, Delay/Flange 1 enabled, there’s no way you can turn on a Rotary Speaker effect in that patch. You can, however, create an adjacent patch that’s identical, except for the effects selection.