The Greer Amps Mori Drive is a classic, mid-focused overdrive pedal from Greer Amps, released to the public on July 22, 2026 after existing previously as an artist-only pedal1. Its circuit is inspired by vintage TS (Tube Screamer) circuitry, built around a JRC4558 chip with asymmetrical clipping for more natural drive tones2. Greer describes it as tuned between TS and K-style frequency ranges, with the mid hump positioned in what the maker calls a sonically pleasing area2.
Where a stock Tube Screamer can feel boxed in, the Mori Drive offers more output volume than a standard TS-type circuit, so it pushes an amp harder without getting congested, according to Delicious Audio's Paolo De Gregorio1. Guitar Pedal X's Stefan Karlsson characterized it as a more refined Screamer, one that supposedly sits better in the mix and delivers a more pleasing output overall3.
The controls
The Mori Drive keeps the familiar three-knob overdrive layout, but mounts the controls on the side of its 1590BB landscape enclosure rather than the top3. Delicious Audio notes the pedal uses a JRC4558 chip, asymmetrical clipping for more natural breakup, and a wide sweet spot tone control1.
| Control | What it does |
|---|---|
| Overdrive | Sets the amount of drive; side-mounted3 |
| Tone | Wide sweet spot tone control, per the maker; side-mounted23 |
| Level | Sets output volume; side-mounted3 |
The tone control's wide sweet spot means there is a broad usable range rather than a narrow window where the knob sounds good, a common complaint with stock TS-style tone circuits. The enclosure's lime green finish and oxblood knobs were noted by Guitar Pedal X at launch3.
Power: 9V to 18V, 7mA
The Mori Drive runs on 9 to 18 volts through a standard center-negative 2.1mm power supply, or on a 9-volt battery2. Current draw is 7mA at 9V and 9mA at 18V2, low enough that it shares comfortably with other pedals on a powered board and puts minimal drain on a battery.
Running the pedal at 18V requires a supply that outputs 18V; a standard 9V supply will run it at 9V only. The battery option makes it usable on a board without a power distribution system.
How it differs from a standard Tube Screamer
The Mori Drive's lineage is the vintage TS circuit with the famous mid hump, a sound Greer had been asked for years to build its own take on1. But Greer did not copy it straight. The maker says the circuit is tuned between TS and K-style frequency ranges, with the mid hump repositioned and more output volume available than a standard TS-type circuit, along with smoother, tweaked clipping2. The asymmetrical clipping arrangement is part of that, aimed at more natural drive tones than the symmetrical clipping of a stock Screamer2.
Delicious Audio's takeaway on the sound:
"There's more output volume on tap than a standard TS, so it pushes an amp harder without getting congested."
Guitar Pedal X framed it as a Screamer with Klon DNA mixed in, calling it a more refined take that sits better in the mix3. For players comparing TS-family pedals, the Boss SD-1 vs Ibanez TS9 comparison covers the two most common stock options in that lineage.
Stacking with other overdrives
Greer says it has stacked the Mori Drive with every single drive circuit the company has built, and with many other companies' drives, and found no bad combination2. The maker's own suggestion for a board is to pair it with the Lightspeed and the Southland2.
That stacking friendliness matters for players who run two or three drives into each other: a mid-focused pedal like this one pairs naturally with a flatter, more transparent overdrive such as the Lightspeed, with the Mori Drive adding the mid push and the Lightspeed supplying the clean-ish body2.
Availability and warranty
The first direct batch sold out at launch, with dealer stock and more expected soon, as Guitar Pedal X reported on July 23, 20263. The maker's list price is $249 USD, with £189.00 GBP also listed on the product page2. Greer covers the pedal with a 5-year warranty to the original owner2, a term Delicious Audio also confirms1.
What reviewers said
Guitar Pedal X's launch coverage summed up the pedal's character:
"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."
Delicious Audio's writeup emphasized the pedal's origin as a long-requested item: Greer had been asked for years to build its take on the old vintage TS-style circuit with the famous mid hump, and the Mori Drive is the answer1.
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Questions
Is the Greer Mori Drive true bypass?
Yes. Greer Amps lists the Mori Drive as true bypass, and Delicious Audio's writeup confirms it. When the pedal is off, your signal passes through without buffering or coloration.
Can the Mori Drive run on a battery?
Yes. The pedal uses a 9-volt battery or a standard center-negative 2.1mm power supply. It draws 7mA at 9V and 9mA at 18V, so a battery lasts a long time at either setting.
How does the Mori Drive stack with other overdrives?
Greer says it has stacked the pedal with every drive circuit the company has built and with many other companies' drives, and found no bad combination. The maker suggests pairing it with the Lightspeed and the Southland on one board.
What warranty comes with the Greer Mori Drive?
Greer Amps covers the Mori Drive with a five-year warranty to the original owner, as listed on the maker's product page and confirmed by Delicious Audio.
Sources (3)
- New Pedal: Greer Mori Drive, Delicious Audio, 2026-07-22
- Mori Drive, Greer Amps
- Guitar Pedal X, Guitar Pedal X, 2026-07-23
