Yup, please note OP that anyone suggesting analog octavers to you is not reading your original description of needing tracking down to G on the E string. That just isn't going to happen with an analog device. Plus, going digital will help with the synthy and even cleaner tones. So as nice as all the other suggestions are, like the Cog pedals (which are wonderful at what they do), forget about them all. You need digital, period.
Have to disagree I've got to say that I've had a whammy and pitchfork yes they track well but felt a bit sterile, if I play cleanly and with a softer touch I can track very low notes with the t70 and also with the redwitch Zeus. But again if you want the octave to be heard and not make things muddy the op would probs end up playing the lines an octave higher which brings the analogue octaves back in the mix
