The Greer Mori Drive is a mid-focused overdrive pedal from Greer Amps, built around vintage Tube Screamer-style circuitry and a JRC4558 chip1. For years players asked Greer for their take on the classic TS-style circuit with its famous mid hump, and the pedal that answered that request spent time as an artist-only pedal before its public release on July 22, 20262. It is now available to everybody2.
What sets it apart from a stock Screamer is the tuning: Greer positions the mid hump between TS and Klon-style frequency ranges, gives it more output volume, and uses asymmetrical clipping for what the maker calls more natural drive tones1.
From artist-only pedal to general release
The Mori Drive was not originally a catalog pedal. It floated around as an artist-only unit for a while before Greer made it available to everybody2. The pedals are built to order, shipping within 2 to 2.5 weeks of order and payment1.
The pedal is built to order rather than stocked in quantity: Greer says orders ship within 2 to 2.5 weeks of order and payment1.
How it differs from a standard Tube Screamer
The Mori Drive is inspired by vintage TS circuitry, but Greer tuned it in ways that change how it behaves on a board1.
| Aspect | Standard Tube Screamer | Greer Mori Drive |
|---|---|---|
| Clipping | Symmetrical clipping stage3 | Asymmetrical clipping, for more natural drive tones1 |
| Mid hump | The classic TS mid hump2 | Positioned in what Greer calls a sonically pleasing area, tuned between TS and K-style frequency ranges1 |
| Output volume | Standard TS output | More output volume available1 |
The practical difference, as Greer describes it: the extra output volume lets the pedal push an amp harder without getting congested, and the clipping is tweaked to be smoother1. Delicious Audio's writeup agrees on the output, noting there is more volume on tap than a standard TS2.
Guitar Pedal X's Stefan Karlsson framed the pedal in his own words:
"This is a more refined Screamer - one in silk slippers I suppose, and one which supposedly sits better in the mix, and delivers a more pleasing output."4
Controls and enclosure
The Mori Drive keeps the control set simple, with three side-mounted knobs in a 1590BB landscape enclosure4.
| Control | What it does |
|---|---|
| Level | Sets output volume4 |
| Tone | Shapes the frequency balance; Delicious Audio describes it as a wide sweet spot tone control2 |
| Overdrive | Sets the amount of drive4 |
Power, bypass and stacking
The pedal runs on a 9V battery or standard power, and is true bypass2. Greer suggests it pairs naturally with other drives in their line, such as the Greer Southland Harmonic Overdrive and the Lightspeed1.
Stacking is a stated strength: Greer stacked the Mori Drive with every drive they have ever built, plus pedals from other companies, and claims they have not found a bad combination yet2.
The Mori Drive is built to order, so it is not an off-the-shelf purchase. Greer says it ships within 2 to 2.5 weeks of order and payment1.
Warranty
Greer covers the Mori Drive with a 5-year warranty to the original owner1. Delicious Audio's coverage lists the same five-year term2.
Videos
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Philip Czarnecki
Questions
Is the Greer Mori Drive true bypass?
Yes. Greer Amps lists the Mori Drive as true bypass, so with the pedal switched off your signal passes through without active circuitry in the way. Delicious Audio's writeup of the pedal confirms the same.
What chip does the Greer Mori Drive use?
The Mori Drive uses a JRC4558 chip, the same dual op-amp family found in vintage Tube Screamer-style circuits. Greer says the pedal is inspired by vintage TS circuitry built around that chip.
How does the Mori Drive differ from a standard Tube Screamer?
It uses asymmetrical clipping rather than the Tube Screamer's symmetrical clipping stage, which Greer says gives more natural drive tones. It also has more output volume than a standard TS, and its mid hump is tuned between TS and Klon-style frequency ranges.
How long does it take to get a Greer Mori Drive?
Greer builds pedals to order. The company says the Mori Drive ships within 2 to 2.5 weeks of your order and payment, so expect roughly a two-and-a-half-week wait from placing the order.
Does the Greer Mori Drive have a warranty?
Yes. Greer Amps covers the Mori Drive with a five-year warranty to the original owner. Delicious Audio's coverage of the pedal lists the same five-year warranty term.
Sources (4)
- Mori Drive, Greer Amps
- New Pedal: Greer Mori Drive, Delicious Audio, 2026-07-22
- Boss SD-1 review, Guitar.com, 2025-04-29
- Guitar Pedal X, Guitar Pedal X, 2026-07-23
