Oh look! This is a thing I can change!
I'm about to leave for tour in a week and some internet chatter had me second guessing my choice of octave pedal for my live rig. I run a guitar amp and a bass amp simultaneously and the bass amp gets a signal that is one octave below the guitar. I currently use an EHX Pitch Fork but the internet consensus seems to be that the Digitech Drop is a superior pedal. So I ordered one. It arrived today and I knew within about 10 seconds that I was sticking with the EHX but I decided to make a clip since this is a purpose that seems popular yet there aren't any comparison clips on the web that I have seen.
Recording rig is as follows:
Guitar in E standard with a humbucker in the bridge > EHX Pitch Fork or Digitech Drop > Yamaha TH10X on the 'bass' model > Garageband
EQ on the amp is flat. No EQ or compression applied in the DAW.
Audio track is sequenced as follows:
Dry guitar > Digitech Drop > EHX Pitch Fork
The primary issue when you are faking bass guitar is volume loss in the octave down signal and extreme treble rolloff in octave pedals. Its very difficult to get away with just an octave pedal into a second amp and have it sound good. In my live rig I use a bass preamp and a compressor after the octave. In the clip, listen for the playing artifacts in each section, especially the string noise and the pick attack. One pedal sounds like it retains a lot of both and the other pedal seems to have a low pass filter well below the frequency range of those artifacts.