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MXR M400 Turbo Tuner Pedal
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Want to Click and Collect or try items at our Guildford Store?
The store is open 10am - 6pm Monday to Saturday and 11am - 5pm Sunday and bank holidays.
The stock information shows the quantity of units that are available to purchase at the Guildford store and the quantity of units that are available at our off-site Guildford warehouse. These stock levels are updated in real time.
Our Click and Collect service is available at our Guildford store from 10am - 6pm Monday to Saturday, and 11am - 5pm on Sunday. You can either choose Click and Collect as your delivery option online or, during store opening hours, call our sales team on 01483 456777 for assistance with placing your order.
If you have placed your order online, you will receive a confirmation email of your order and a separate follow-up text or email to confirm when your item is ready for collection.
Please do not come to the store before you have received the follow-up message, as your order may not yet be ready at the store.
If the only available stock is in our off-site warehouse it can be brought to the store location for you to try - you just need to contact the store within opening hours. Please note any requests received after 3.30pm will not arrive at the store until the following morning.
Please be aware that stock availability can change quickly both online and in-store, so we would always recommend placing your Click and Collect order as soon as possible to reserve your item.
SKU: MXR-EFX-M400
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Product Description
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.
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.
Specifications
General
- 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: Switchable true / buffered bypass
- Buffered Submodes: 3 selectable buffered modes
Connectivity
- Input: 6.35 mm (1/4") instrument input
- Output: 6.35 mm (1/4") output
- Power Passthrough: 9V output for powering an additional pedal
- USB: USB-C port for firmware updates and upcoming editor software
