Ha! Yeah - I've found my RC-20 looper to be great for that. I can put it FIRST in my chain (I'd usually run it last for performing) - that way I can fine-tune my effects setup with the exact-same, repeating bass part going through everything!...An interesting test might be for someone to post a raw bass clip with some fast playing & some chords & high register and low register playing and both lowstar & i should run that raw bass file through our DAWs out to our octave pedals and back in with a bunch of comprable settings and then post the files here. it'd be interesting to see how they sound side-by-side.
I had no idea that the SubBlaster was polyphonic! Dang-it! - if I would've known that, I would have looked into them more carefully before I bought my OC-3. I did get to play one briefly once, and the tone was very solid and authoritive!
I only use my OC-3 in poly mode - and while it really does NOT truly "track chords", it does exhibit flawless tracking for even sloppily-played mono stuff. The tone can be strangely nasal-y, and as you go to lower and lower notes, it gets worse, to the point of fairly 'unmusical', I think.
It's the pedal I use least. I bought it 'between bands', and I'm still 'between'. But I'll bet that when I'm gigging again - especially if it's with another three-piece - I'll use it much more often. Playing in its sweet-zone - that'd be like maybe low-A, up to two-octaves up the G-string (That's using the "Guitar"-input; the "Bass"-mode only works up to one octave up the G!) - it really does well-simulate a guitar playing in octave-unison with a bass!
Another problem with it - which I JUST don't get, but I've heard it from others here too - is that it cuts-out a bit when you engage the effect! I dunno what's with dat.
Joe