I've noticed that octaves, analog at least, don't like all the resonation up high, and down low too. Placing something like a RFE or Studio Boost before my octave wrecks the tracking, clean it up, boost the signal and its about perfect, definitely down to a low G standard, E if I play closer to the neck. Correct me if I'm wrong but I think that was the idea behind the 1st "channel" Clean, rolling the clean filter back is the same as rolling tone back, and that in turn feeds the Synth "channel". I use "" because they aren't different voices or channels, but its easier to understand imo