The TWA MC-01 MicroChasm is an octave box: a pedal that generates notes an octave below, an octave above, or both, on top of your instrument's own signal. It is 100% analog, and TWA describes the +1 octave voice as creating a searing upper-octave harmonic along with Distortion, Octavia and Ring-Modulator effects, so the up voice reaches well past a clean doubled note1.
The octave-down side borrows the fast-tracking octave-down circuit from TWA's Great Divide, another of the company's octave pedals1. TWA says that circuit tracks quickly and accurately down to low-G on a bass guitar, and describes the MicroChasm overall as offering "a bottomless pit of pleasing, pliable analog octave tones for both Bass & Guitar"1. All of it is packed into what the maker calls a compact, pedalboard-friendly package1.
"a bottomless pit of pleasing, pliable analog octave tones for both Bass & Guitar"
Controls and the Solo footswitch
The MicroChasm's front panel is simple, and the maker's page names two ways to shape what it does1:
| Control | What it does |
|---|---|
| Tone | Sweeps the octave voices from deep, round subs to edgy, square wave synth pulses1 |
| Solo (external footswitch) | Selects and solos either the -1 Octave voice or the +1 Octave voice1 |
The Tone control is the main shaping tool for how the low and high voices sit in a mix1. At one end of its sweep you get a full, round sub-octave; at the other, the harder, square-wave character TWA describes as synth-like1.
There is also a footswitchable Solo feature. Using an external footswitch, you can select and solo either the -1 Octave voice or the +1 Octave voice1. For a player, that turns the MicroChasm into a two-character pedal on stage: one stomp holds the sub-octave, another throws the upper-octave harmonic forward, without touching the knobs mid-song.
Availability
The MicroChasm is listed as sold out. Godlyke's page asks buyers to email to inquire about 2026 delivery, so new units come by waitlist rather than off the shelf1.
The listed price shown on the maker's page is £176.00 GBP as of 26 October 20261.
Where it sits among octave pedals
The MicroChasm belongs to the wider family of octave and pitch pedals. Its distinguishing points, per the maker, are1:
- An all-analog signal path1
- A Great Divide-derived down voice that tracks a bass down to low-G1
- An up voice that pushes into Distortion, Octavia and Ring-Modulator territory rather than staying a clean octave1
Players who want more of that down-octave character can look at the TWA GD-02 Great Divide, the circuit the MicroChasm draws from1.
Questions
Does the MicroChasm track a bass guitar?
Yes. TWA says the MicroChasm's 100% analog octave-down circuit tracks quickly and accurately down to low-G on a bass guitar, which covers the low E string plus a fourth below it. The maker describes the pedal as offering analog octave tones for both bass and guitar, so bass players are part of its intended audience rather than an afterthought.
What does the Solo footswitch input do on the MicroChasm?
The Solo feature lets you select and solo either the -1 Octave voice or the +1 Octave voice using an external footswitch. In practice that means you can leave the pedal on and, from the floor, switch between the sub-octave and the upper-octave voice without bending down to turn knobs, which suits live use.
Is the TWA MicroChasm still available?
The maker's product page lists the MicroChasm as sold out, with delivery handled by waitlist inquiry: Godlyke asks interested buyers to email about 2026 delivery. So the pedal is not sitting in stock, but TWA has not discontinued it outright and is taking inquiries for future units.
What is the TWA MicroChasm's Tone control for?
The Tone control shapes the octave voices across a wide range. TWA describes it as moving from deep, round subs to edgy, square wave synth pulses, so at one end you get a full low-octave tone and at the other a harder-edged, synth-like character from the same pedal.
Sources (1)
- MC-01 MICROCHASM™, Godlyke Distributing, Inc.
