Gold-Standard Strobe Tuning Precision Meets MXR Reliability

Close enough isn't good enough when your tone is on the line. The Guitar Sanctuary is thrilled to welcome back the legendary precision of Sonic Research design to our pedal collection with the MXR M400 Turbo Tune.

Engineered directly by Sonic Research founder Roger Schlichtig, this collaboration packs the core engine of the industry-standard Turbo Tuner into a road-tested MXR chassis. Delivering fraction-of-a-cent, real-time strobe accuracy, it locks in your tuning instantly whether you are under bright stage lights or tracking in the studio.

Product Intelligence Attributes

• Best For: Studio Recording, Live Performance, Session Work, Touring Pros, Worship
• Precision Rating: Fraction-of-a-cent real-time strobe tracking
• Tone Profile: 100% Transparent Signal Integrity (Switchable True/Buffered Bypass)
• Compared To: Original Sonic Research ST-300, Peterson Strobostomp HD, Boss TU-3
• Engineering: Designed by Roger Schlichtig (Sonic Research) & Built by MXR

Key Features & Performance Specs

• Sonic Research Engine: Built around the gold-standard Turbo Tuner core engine for instant, lag-free pitch tracking.
• Real-Time Strobe Display: Ultra-responsive display shows pitch movement instantly without digital calculation lag.
• 5 Customizable Presets: Supports alternate tunings, up to 12-string setups, and ±50 cent offsets.
• Stage-Ready Display: 4 adjustable brightness levels ensure perfect visibility from dark club stages to bright outdoor festivals.
• Flexible Signal Routing: Switchable True Bypass or Buffered Bypass (featuring 3 distinct buffered submodes).
• Pedalboard Friendly Utilities: 9V passthrough output powers an additional pedal; USB-C port enables firmware updates and future editor software connectivity.