The Function f(x) Clusterfuzz Micro is a compact fuzz pedal, described by its maker as the smaller brother to the Clusterfuzz and Clusterfuzz Jr. pedals. Function f(x) says it is the same circuit under the hood as those pedals, with a few less features to allow it to fit into a standard 1590A-sized enclosure, and that it uses the same types and values of components as its bigger siblings, simply scaled down to a smaller footprint based on customer feedback1.
"the same circuit under the hood, with a few less features to allow it to fit into a standard 1590A-sized enclosure"
Controls and clipping options
The Micro carries four knobs, each doing a single job:
| Control | What it does |
|---|---|
| Volume | Sets the pedal's output level1 |
| Tone | Shapes the fuzz's treble content1 |
| Fuzz | Sets the amount of fuzz saturation1 |
| 8-Bit | The feature carried over from the larger Clusterfuzz designs1 |
The 8-Bit control is the feature that sets this pedal apart on a board, and it carries over from the larger Clusterfuzz designs in the family1.
Function f(x) gives the pedal three clipping options for different saturation levels1:
| Clipping option | Character |
|---|---|
| No diode clipping | Open, unclipped fuzz voice1 |
| MosFET | MosFET-flavored saturation1 |
| Silicon diodes | The harder edge of silicon diode clipping1 |
All three live in one compact box, so the player chooses between them rather than between pedals1.
Size, power and board fit
The Micro is built into a standard 1590A-sized enclosure, measuring 3.6″ x 1.5″ x 1.2″ (92.5 x 38.5 x 31 mm) and weighing 7 oz (198 g)1. Switching is true bypass mechanical switching1.
- Power: 9v DC operation, which the maker calls industry standard1
- Current draw: 10mA1
- Input impedance: ~300K1
- Buffers: The maker notes it works with buffers1
As of September 25, 2026, the maker's product page lists the Clusterfuzz Micro at a list price of $189.00 USD2.
Where it sits in the Function f(x) range
The Micro is one of three Clusterfuzz designs from Function f(x), alongside the full-size Clusterfuzz and the Clusterfuzz Jr.. The maker's framing is consistent across its mini pedal pages: the same circuit under the hood, with a few less features to fit the smaller 1590A enclosure13.
| Pedal | Enclosure | Features |
|---|---|---|
| Clusterfuzz | Full size | Full feature set1 |
| Clusterfuzz Jr. | Smaller package | Reduced feature set3 |
| Clusterfuzz Micro | Standard 1590A-sized | Fewer features, same circuit1 |
The trade the maker describes is straightforward: fewer features in exchange for a footprint that suits tight pedalboards, with the component types and values unchanged from the bigger siblings1.
Questions
Is the Clusterfuzz Micro true bypass?
Yes. Function f(x) specifies true bypass mechanical switching on the Clusterfuzz Micro, so when the pedal is off, your guitar's signal passes straight through to the amplifier without going through the fuzz circuit. That matters on a crowded board, where a compact pedal like this is often left on all the time and you want the bypassed tone to stay untouched.
How much current does the Clusterfuzz Micro draw?
Function f(x) lists a 10mA current draw at 9v DC operation, which the maker describes as industry standard. That is a light load, so the Micro sits comfortably on a daisy-chained supply alongside other standard 9V pedals without needing its own dedicated output.
Does the Clusterfuzz Micro use the same circuit as the full-size Clusterfuzz?
Function f(x) says it is the same circuit under the hood, with a few less features to allow it to fit into a standard 1590A-sized enclosure. The maker also states it uses the same types and values of components as its bigger siblings, scaled down to a smaller footprint based on customer feedback.
What size is the Clusterfuzz Micro enclosure?
The Micro measures 3.6 inches by 1.5 inches by 1.2 inches, or 92.5 by 38.5 by 31 millimeters, in a standard 1590A-sized enclosure. It weighs 7 oz, or 198 g. That is the small footprint Function f(x) uses across its mini pedal line.
Sources (3)
- Clusterfuzz Micro, Function f(x), 2025-12-14
- Clusterfuzz Jr., Function f(x), 2026-09-25
- Mini Pedals, Function f(x), 2020-04-04
