Audio Sprockets

Audio Sprockets ToneDexter


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ToneDexter®, from Audio Sprockets, is an amazing new pro preamp for acoustic guitar, violin, upright bass, mandolin and more, that restores the missing body sound to an instrument’s piezo pickup.

ToneDexter stores WaveMaps® of your studio mic sound that you can recall when using just your pickup. The WaveMaps transform the pickup signal so that it sounds like a mic—lush, resonant, and natural. You can store WaveMaps of different mic positions and different mics, for each of your instruments.

Peter Frampton – “From the first listen, it’s easy to hear that ToneDexter is amazing!”

Thomm Jutz – “Finally I feel like I’m playing a real acoustic guitar onstage. There’s absolutely no going back for me.”

Jason Bailey – “I didn’t realize how much I needed the ToneDexter until I got one. Wow!”

Paul Jacob Cartwright – “I can say with no exaggeration that the ToneDexter is the single most important purchase I’ve ever made for live acoustic amplification of my violin, guitar and mandolin.”

The ToneDexter is supplied with a USA power adapter so you will need a UK travel adapter. You can also use any UK power supply rated 9v - 15v that supplies at least 450mA.


Works on any acoustic instrument, with most active or passive piezo pickup systems
Stores 22 custom WaveMaps, selectable via 11 position rotary switch and bank select switch
Mute switch that activates a built-in high precision tuner, accurate to within 1 cent
Boost switch for solos with 0-8dB of settable gain via rear panel pot
Bass and Treble EQ
Sweepable notch filter for feedback suppression
Character control which adds additional punch to the WaveMap
Latency less than 1ms
Effects loop (TIP send, RING return)
1/4″ pickup input, high impedance (1MΩ)
1/4″ line output with output level pot on front panel
XLR DI output, with rear panel option switch for fixed level or level that follows output level pot
Analog boost and mute circuits positioned after effects loop, so no headroom loss when boosting
XLR mic input with 48V phantom supply, used for training
Headphone output
Phase (polarity) switch on rear panel
+/-15V internal supplies for professional headroom and dead quiet operation
SD card slot for field upgrade of software
6.3″ W x 5.9″ D x 2.3″ H

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