It is digital. An effect like this could NEVER be created in the analog domain.
Please use the power supply that was included with the Pitch Fork to prevent and noise coming in from other pedals.

Use an isolated power supply. That means one that has all it outputs isolated.
Cheap multi supplies tend to cause problems because their outputs are not isolated.
We are addressing these cheap supply issues.
You can also use a Diago Isolator Adaptor for our pedals and other companies pedals that have this issue with non isolated power supplies.

It is possible to make a pure analogue clean(ish) octave down circuit like the Electro-Harmonix Octave Multiplexer. These can only be monophonic and even the very best ones ever made can be “glitchy”, meaning that they don’t track perfectly and will jump between octaves. They tend to have a sweet spot and tend to work better with low notes. Being monophonic and working better with low notes makes these popular with bass players.

It is possible to make a DIRTY NOT CLEAN, octave up circuit like the Electro-Harmonix Octavix. I don’t think the Octavix is pure analogue, but it is possible to make the circuit purely analogue. These can also only be monophonic (mostly) and they also tend to have a sweet spot which is about the top third of an electric guitar fretboard. You can play double note parts, but you quickly get harmonic interference that sounds like ring modulation.

Some companies combine the clean octave down with the dirty octave up. The Electro-Harmonix Micro Synthesizer does this. You can blend in an analogue octave down, an analogue octave up, the original signal, and a “square wave” which is really just a massively clipped signal – basically distortion. You can then apply filters to them. It’s all analogue and gives you both an octave up and an octave down.

To get anything other than an octave with analogue circuitry, you need to use a phase-locked loop (PLL). This DOES NOT give you the original sound raised or lowered by some arbitrary interval. It allows you to control the pitch of a generated tone, like an analogue synthesizer, with the pitch of an input, like a guitar. So you can have a synthesizer that plays along with you at some arbitrary interval that you can set. It doesn’t sound like a guitar harmonizing with you. It sounds like a synthesizer harmonizing with you. Earthquaker Devices Data Corrupter is all analogue PLL INTERVAL up and/or down device that does this.

If you want GLITCHLESS and CLEAN octave up and/or down, the only way to go is DIGITAL. The Electro-Harmonix Micro POG is a clean octave up/down machine. It is digital. The digital circuit allows algorithms that are smart enough to handle chords and make them sound good by preventing harmonic interference. The Micro POG only gives you octaves, but they are clean, they track perfectly, and they are POLYPHONIC.

The Pitchfork is kind of like the Micro POG, but for any arbitrary pitch. It’s also clean, glitchless, and polyphonic. It’s also DIGITAL. Why would they make both a Micro POG AND a Pitchfork? The algorithms are slightly different. The sounds you get when you mix the intervals together is slightly different. Some people prefer the tracking and tone of the POG and some people prefer the Pitchfork. Most of the reviews I’ve seen comparing the blended octave up AND down polyphonic response or just octave up of the POG and the Pitchfork give the POG a slight edge in terms of tone. People who have both seem to think that there’s room for both on their pedal board. People who choose between the two tend to pick the Pitchfork because it’s much more flexible.

Both of these (and their relatives), by necessity, are DIGITAL circuits.

<It is possible to make a pure analogue clean(ish) octave down circuit like the Electro-Harmonix Octave Multiplexer. These can only be monophonic and even the very best ones ever made can be “glitchy”, meaning that they don’t track perfectly and will jump between octaves. They tend to have a sweet spot and tend to work better with low notes. Being monophonic and working better with low notes makes these popular with bass players.>

not true, you can make a clean polyphonic analogue octave up or down circuit.

</If you want GLITCHLESS and CLEAN octave up and/or down, the only way to go is DIGITAL. The Electro-Harmonix Micro POG is a clean octave up/down machine. It is digital. The digital circuit allows algorithms that are smart enough to handle chords and make them sound good by preventing harmonic interference. The Micro POG only gives you octaves, but they are clean, they track perfectly, and they are POLYPHONIC.>

digital obviously makes things easier. but you can make a clean, polyphonic, octave up, down, or somewhere in-between pedal with analogue circuitry, it would just be extremely difficult to do, would recrquire a HUGE amount of electronics, and be expensive. But it is possible, especially with modern advances in analogue circuitry. (there is a push recently to make more advanced analogue circuitry that can do more things, because analogue circuitry can’t get hacked the way digital can.)