Modulation That Follows the Beat (All of Them)

You can spend hours stacking pedals to build a rhythmic modulation setup and still end up with a phaser that wanders off-time halfway through the song.

The Electro-Harmonix Mod Rex fixes that by putting four synced modulation effects into one box: mod, trem, pan, and filter, all driven by a shared BPM and clock.

Each effect runs on its own selectable rhythmic subdivision, so you can create complex, polyrhythmic textures that stay perfectly in sync. A slow pulsing trem with a fast stuttered pan? Easy. A triplet-timed filter sweep on top of a square wave LFO? Done.

Why it’s a Cool Find:

• Four modulation blocks that sync to a shared tempo
• Choose different divisions for each effect
• Tap tempo or MIDI clock input for full external sync
• Stereo ins and outs to make full use of the motion
• Deep control without diving into menus or screens

Use it for:

• Building rhythmic synth-like textures on guitar
• Stereo pedalboard rigs that need movement
• Locking trem and filter to a click track
• Creating patterns that feel DAW-like without being locked to a grid

The Mod Rex is for players who want modulation to be part of the groove, not something floating on top of it. Once you hear it working in sync, your old tremolo might start collecting dust.

Check it out here →