OPFXS releases Dig Deep Sub Octave Mk3 octave-down pedal
October 22, 2025 · 3 sources
OPFXS has released the Dig Deep Sub Octave MK3, an octave-down pedal for guitar, reported by Delicious Audio on October 22, 20251. Guitar Pedal X had covered it earlier, on September 2, 20252.
The pedal generates a monophonic bass line from the guitar signal. Delicious Audio describes it as generating "a rich, monophonic bass line from your guitar signal, transforming a thin tone into a massive, layered sound without affecting the integrity of your original dry signal"1. Guitar Pedal X describes it as a monophonic octaver that does one note at a time, with lower strings receiving octave processing while upper strings remain unaffected2.
Delicious Audio lists five primary knobs and four assignable controls via a dedicated editor, which it says fine-tune everything from the mix of the -1 and -2 octave signals to the filtering of the bass tone, along with 3 user presets, full MIDI implementation and a USB-C editor1. Guitar Pedal X lists the controls and ports as follows2:
| Item | Detail |
|---|---|
| Controls | Dry [-1 Oct], Sub Mix [-2 Oct], Low Pass [High Pass], Ctrl 1 [Ctrl 2], Split, Shift [Save], Wave, Range, Presets I-III |
| Ports | 9V DC [-] 200mA, MIDI In, Remote, TS In, TS Sub Out, TS Out |
By default the dry signal and the wet sub-octave are blended at the Out port; in Split mode the wet sub-octave goes to the Sub Out port and only the dry signal comes out of Out2. Delicious Audio says the algorithms are intended to track across the fretboard, including arpeggios and complex chords, and that the pedal suits 6-string to baritone guitars1.
No US list price is given in the coverage. Delicious Audio's report gives no price or availability details1.
"This advanced and cutting-edge octave-down pedal generates a rich, monophonic bass line from your guitar signal"
The Dig Deep name dates back further: Gearnews reported an earlier Dig Deep octave pedal in October 2019, describing it as using only two controls, Volume for Clean and Volume for the octave tone, and citing an RRP of EUR 1503. That report also said the unit could be used as a pitch-shifter and would take input from guitar to synth3. The MK3 coverage does not compare the two directly.
More octave and pitch pedals are listed in our Octave & Pitch Pedals section.