Detail 01
High output on tap
There's enough level above unity to slam the front of a tube amp, so it doubles as a hard boost.
Product detailSKU #1322681180888
MXRM77 Custom Modified Badass Overdrive Guitar Effects Pedal
aggressivehigh outputwarmmetalrockhard rock
Independent shopping perspective
The Korena take
A compact overdrive built for a louder, more aggressive push than a standard tube-screamer voicing. For players who want the drive to lead, not just boost.
Strong match
Who this is for
- Pushing a clean amp into rock rhythm tones without a channel switch
- Players who find standard overdrives too polite or mid-scooped
- Tight pedalboards where a small enclosure matters
Consider the trade-offs
When to look elsewhere
- Players wanting transparent, always-on boost that stays clean
- High-gain metal rhythm — this is overdrive, not distortion
- Anyone chasing a soft, compressed blues breakup
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Overdrive, not distortion
Gain reacts to pick attack and guitar volume. Roll back on the guitar and it cleans up.
Detail 03
MXR-size enclosure
Standard compact footprint. Fits pedalboard real estate most players already plan around.
Detail 04
Aggressive, punchy voicing
More upper-mid cut and less scoop than a typical screamer, so it sits forward in a band mix.
Final check
Know before you order
- 01Power supply and cables are separate — budget for both
- 02Aggressive voicing can get harsh through a bright solid-state amp
- 03Try it in front of a slightly-driven amp; fully clean amps show less of its character
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Does it need a battery or adapter?
It runs on standard pedal power. A supply isn't included, so plan on a 9V adapter or a board power brick.
02Is this good for metal?
It's an overdrive. It works well pushing an already-gained amp for tightness, but it won't produce modern metal distortion on its own.
03Can I leave it on all the time?
Yes, though its voicing is colored rather than transparent. Always-on players usually want something flatter underneath it.
04Will it work with a bass or keyboard?
It's a guitar pedal. Low end will thin out, so bass players generally want a drive designed to preserve fundamentals.
