I was dinking around my my BOSS OC-2 in the effects loop of my BOSS GT-10B and accidentally fed the OC-2 a heavily boosted fuzz signal. Interestingly, the OC-2 behaved well in this scenario, the output signal of the OC-2 changed significantly, became fuller, and seems to clip pleasantly.
It produces an almost gated fuzz type sound. I tested feeding it various signals/effects, but always really hot, and it looks like simply feeding it a heavily boosted clean signal (for example, +40db of extra bass) has the same effect. The source signal (clean boost, fuzz, etc.) only changes the overall sound quality slightly based on my testing. The trick is to seriously overdrive the OC-2's input.
I don't recall ever reading about anyone feeding the OC-2 a hot signal, usually people run it clean and then into fuzz/dirt after the OC-2. Note you cannot get the same effect feeding the GT-10B's standard octaver.
Quick sound clip. Bass into GT-10B, OC-2 in the FX loop, then XLR out to my interface. No compression, amp sim, etc, just dry bass and the following effects only. EQ +20db low +20db overall, tight noise gate, OC-2 soloed on OCT1. Then I add maxed out tremolo after the EQ but before the OC-2 to glitch the OC-2.
Obviously it'd benefit from further tone sculpting, but I wanted to share the raw tone and fish for some comments.