By the way, it depends how crazy you'd like to go because you could also start thinking about LFO modulated Bitcrushers or Ring Modulators and that kind of stuff.
Oh yeah, and random step phasing is pretty different sounding too, as is random step filtering which the other guys here already mentioned (Subdecay Prometheus DLX).
Lots of interesting 'modulation' is also based on granular synthesis, if you go down that road you'll get into the likes of the Montreal Assembly Goodbye 24 and that kind.
Which brings me to manual flanging because some of these sounds reminds me of that, these metallic kind of overtones that sweep through the pitch, lookup the Lastgasp Art Laboratories Misty Cave for instance.
Oh yeah, the Moog MF104M is also pretty crazy and unique with the different waveforms as square wave and random for the modulation.
I guess one of the tickets to not so commonly heard modulation is in the LFO / waveform that's moving / shaping the sound, square wave, pulse wave, sawtooth wave, random (s&h) and step waveforms make something sound different from more regular effects which are usually sine wave or triangle wave based.
You could for instance also buy a Copilot Broadcast and control the expression input of one of your pedals (if it has such an input) and make different sounds.
Talking about vibes I can't recommend the Micro Vibe much as it's pretty thin sounding in my opinion, it sounds okay on distortion / drive but clean it's not great at all so it's not very versatile.
My favorite vibe is the Black Cat Vibe, it also does a nice vibrato.
The Fulltones also weren't my cup of tea (a bit thin sounding still), but again, this could be the ticket if you mostly would use it with drive.
Same goes for the Roger Mayer vibes i.m.o.
The Mojo Vibe is pretty nice, only a bit midrangey and stiff feeling / sounding in my opinion, not as fat and organic as the Black Cat Vibe.
The Hughes & Kettner Tube Rotosphere is in my opinion one of the nicest sounding rotary pedals out there.
It's just so nice and raunchy.







