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ToneDexter is the new preamp for acoustic guitar, mandolin, violin, upright bass, and more that restores the missing body sound to an instrument’s ordinary piezo pickup

  • $495.00USD
In stock (4 items available)


Play for just a minute with both a mic and your pickup plugged in while ToneDexter learns the difference between your pickup sound and the mic sound. Then, put the mic away and smile! Say goodbye to that quacky, artificial, poorly balanced tone and say hello to your instrument’s true voice, only louder!

Audiosprockets has worked hard to engineer it with for best possible sound, professional features, ease of use, and maximum affordability. They believe they’ve accomplished their mission, as do scores of professional and amateur users. ToneDexters are shipping and the excitement continues to build!

How it Works

ToneDexter restores the rich body tone of your acoustic instrument to the pickup using proprietary digital signal processing technology combined with a pristine analog signal path. Audio Sprockets has created a way to learn the difference between the sound coming from the pickup and the sound coming from a microphone, placed in front of the instrument, and use that information to create a transformation they call a WaveMap. Think of it as charting a course from point A to point B.

When you first get your ToneDexter, you do a one-time training session with both a mic and the pickup plugged into ToneDexter. This way, ToneDexter can listen to both signals simultaneously and learn the difference between the two.  By playing for about a minute, ToneDexter figures out how to simultaneously correct for the pickup’s deficiencies andrestore the missing body tone to the pickup signal, and creates the WaveMap. With a simple press of a button, ToneDexter stores that WaveMap in one of the eleven available preset locations. You can then put the microphone away and enjoy beautiful, lifelike sounds from your guitar, violin, mandolin, or other acoustic instrument.


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

a mute switch that activates a built-in high precision tuner, accurate to within 1 cent

a boost switch for solos with 0-8dB of settable gain via rear panel pot

bass and treble EQ

a sweepable notch filter for feedback suppression

a character control which adds additional punch to the WaveMap

latency less than 1ms

an 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

    • Weight or dimensional weight (for freight calculation)
      2 lbs
    • SKU
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