I mostly use an EQ (Source Audio EQ2) in front of my tub amps to create an additional tone variation. It has 8 accessible presets without using MIDI control, but you can't switch the presets with your foot without an additional footswitch.
That said, I have a Source Audio UltraWave distortion which goes from mild (clean boost), to insane; and has deep editing software / online patch exchange for sharing patches, MIDI control and much more. Very versatile, and sounds great, or nasty, worth a look and listen. IMO
Also, the multiband lets you dial in different distortions on different frequency bands, so you can keep your low end tight, and control the icepicking and sustain on the high end, and balance the mids to keep them from getting muddy or wooly.
FWIW, this replaces their multiwave distortion which I also own since they were new; the Soundblox Pro format was huge, but it also had a graphic eq on top that was easy to use which they made into a separate pedal.