The MXR M400 Turbo Tuner is a compact, pro-grade strobe tuner pedal that delivers fraction-of-a-cent accuracy on any stage or in the studio. Built around the legendary Sonic Research Turbo Tuner engine and personally engineered by founder Roger Schlichtig, it gives you lightning-fast, rock-solid tuning with modern flexibility, all in a rugged MXR enclosure. If you are tired of tuners that are just “close enough”, the Turbo Tuner locks your pitch in with forensic precision, so chords ring sweeter, double-tracked parts sit tighter and your sound feels more confident under the fingers. With real-time strobe feedback, customisable presets and switchable true or buffered bypass, it drops straight onto any pedalboard and integrates seamlessly with the rest of your rig. Strobe Accuracy You Can Hear The MXR Turbo Tuner uses a real-time strobe display that tracks your pitch with fraction-of-a-cent precision. Instead of vague needle movements or laggy LEDs, you get immediate visual feedback that lets you dial in perfect tuning in seconds. The result is a more focused, harmonically rich tone, whether you are playing clean arpeggios, big open chords or high-gain leads. Built on the Sonic Research Gold Standard At the heart of the M400 is the same core engine that made the original Sonic Research Turbo Tuner a benchmark for professional players and techs. Personally engineered by Sonic Research founder Roger Schlichtig, it delivers the same ultra-accurate performance in a pedal that meets MXR’s renowned roadworthy standards, ready for constant gigging and touring. Custom Presets for Any Instrument Five user presets let you tailor the Turbo Tuner to your exact needs. Each preset can support up to 12 strings and offsets of up to ±50 cents, making it ideal for alternate tunings, extended range instruments or intonated setups that need precise pitch offsets. Once saved, your favourite setups are just a footswitch press away, so you can move between tunings quickly and confidently mid-set. Stage-Ready Control and Connectivity Four selectable brightness levels keep the strobe display clear in any environment, from dark clubs to outdoor festival stages. Switchable true or buffered bypass with three buffered submodes lets you integrate the tuner exactly how you want in your signal chain. A 9V passthrough output can power an additional pedal, while the USB-C port supports firmware updates and upcoming editor software, keeping your tuner current and customisable. Key Features Real-Time Strobe Display – The ultra-responsive strobe readout tracks your pitch in real time with fraction-of-a-cent accuracy, so you can see and correct even the smallest deviations instantly. This makes tuning quicker, more precise and more reliable than with standard needle or LED tuners. Five Customisable Presets – Store up to five different setups, each supporting as many as 12 strings and ±50 cent offsets. Whether you use multiple guitars, alternate tunings or compensated intonation, you can switch between perfectly tailored configurations at the tap of a footswitch. Switchable True/Buffered Bypass – Choose between true bypass for a completely direct signal path or buffered bypass with three submodes to help preserve your tone over long cable runs and complex pedalboards. This flexibility lets you integrate the Turbo Tuner into any rig without compromise. Stage-Ready Power and Visibility – Four brightness levels keep the display readable in any lighting, while the 9V passthrough output allows you to power an additional pedal from the same supply. Combined with USB-C for firmware updates and future editor software, the M400 is built to adapt and stay current on modern boards. SpecificationsGeneral Product: MXR M400 Turbo Tuner Tuner Type: Strobe Accuracy: Fraction-of-a-cent Presets: 5 user presets String Support: Up to 12 strings per preset Offset Range: ±50 cents Controls & Display Display Type: Real-time strobe Brightness: 4 selectable levels Bypass Modes: Swit…

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