Hi Jonne,
You can do "takeoff" style effects with ModFactor by attaching an expression pedal and assigning it to control Depth and Intensity. You could also save two Presets next to each other and switch between them- one at a "normal" Flanger setting, and one stored at the "takeoff" setting.
Random modulation is what ModFactor is all about! The D-Mod and S-Mod knobs allow you to modulate the modulation, resulting in organic and varying sweeps. The Shape knob and the Mod Source knobs allow you to choose from a list of waveshapes for the modulations.
Have fun!
Alan
