µTune (uTune) – microtonal modular multitool

Available for pre-order now!

Description | Features | User Manual | Order online | FAQ


Tubbutec µTune is a tool designed to serve all needs that may arise when dealing with microtonal scales in a modular context. But of course you can also use in a normal, not microtonal way.

Main features

  • Two channel microtonal Midi to CV/Gate interface with various voice assign modes
  • A two channel microtonal quantizer / mapper
  • Two channel CV/Gate to midi conversion sends microtonal midi
  • A built in scale editor to conveniently edit, load and save scales from an SD card
  • Midi router/merger to route midi note and clock data independently between USB, DIN midi and µTune
  • Freely configurable inputs and outputs. Can detect if input is plugged in and change behaviour accordingly which makes the module extremely flexible
  • 10 point VCO calibration to linearise VCO CV response
  • High precision 16 bit outputs, resolution about 0.15mV / 0.2cents with a voltage range of 10V
  • Built in two channel tuner with a wide pitch range
  • V/Hz mode with adjustable precission
  • Peripherals: 2x analogue in, 2x analogue out, 2x digital in, 2x digital out, Mini USB B device midi in/out, DIN midi in and out
  • Also features: Midi monitor, various alternative note notations, midi note on and off velocity mapping, adjustable midi base notes, transpose and shift scales via CV, pitch bend in, scale masks, and much more…
  • An extension module to add more channels is in developement
  • Designed and made in Germany
  • Comes with: SD card with pre-installed scales, USB Cable Mini B to type A, Eurorack power cable
  • Available as completely assembled module and DIY version
  • For a complete list of features please refer to the user manual.

Some features in more detail

Quantizer / Mapper

CV inputs are quantized with adjustable V/Octave step size and use a hysteresis to achieve stable input detection. The detected input value can be mapped to scale degrees, but can also be used to transpose or shift the scale of an other channel. The quantizer can run in continuous, gated or triggered mode.

Midi to CV interface

Tubbutec µTune contains a complete two channel midi to CV/Gate interface. It features various assign modes, such as dual monophonic, multiple polyphonic and random. Mono mode features a ‘last’ note priority encoder which memorizes the last 16 notes. It is also possible to output midi clock and start/stop signals as well as link an output to a midi controller.

Scale editor

The powerful scale editor lets you easily create and modify scales. For each note of a scale you can edit the pitch in cents, fractions or select from a list of common intervals. Scales not based on the octave are possible and up to 128 notes per scale are supported. The editor contains a short cut to quickly create EDO scales. You can change the root of a scale via a shift value and deactivate notes to create ‘sub-scales’. The scales are stored on the SD card in the popular Scala format, so it is possible to use them elsewhere.

File browser

The built in file browser lets you navigate the SD card, load and save scales and vco calibration data. While navigating it shows a preview of the scale you have currently selected. It is a planned feature to also create, move and delete files and directories.

VCO calibration

No analogue VCO has a perfectly linear CV to pitch response. A built in 10 point VCO calibration curve makes sure your VCO has better linearity over the full range of 10 octaves. For calibration the internal tuner is used to track the pitch of the VCO and adjust the output voltage accordingly. VCO calibration data can be saved and loaded from the SD card. We are currently working on an automatic VCO calibration procedure as well as a closed loop continuous pitch correction for µTune.

CV to midi interface

Tubbutec µTune contains a two channel CV/Gate to midi converter. Quantizer output and gate input signals are mapped via the current scale and sent to midi-out as micro tonal midi messages using note on/off and pitch bend messages.


Tubbutec µTune includes a two channel tuner / frequency counter. You can use it to tune and calibrate your VCOs. The picture on the right shows the ‘overview’ screen with detected frequencies, input and output notes and the loaded scale.

MIDI router

A flexible midi router and merger lets you route midi note and real-time messages independently. This turns µTune into more than one tool: you can for example route the USB in to DIN midi out, but have the quantizer on channel run independently. Map CV in 2 is mapped to USB out, but DIN midi in controls CV out 2. You get the idea, possibilities are endless…

Firmware update from SD card

Firmware updates with new features can be easily performed by putting a file on the SD card and starting the update. We have many ideas ans are looking forward to make this module even better.

Flexible I/O configuration

Tubbutec µTune can detect wether an input is used and change the configuration accordingly. For each of the four possible modes (cv and gate not plugged in, cv only plugged in, gate only plugged in and both plugged in) you can configure the function of each input and output. This can be done in a simple way which is sufficient in most cases, or you can specify the behaviour in full detail.
Here is a typical example:
– If neither CV-in nor Gate-in are used: CV-out and gate-out are used as midi to cv interface.
– If you then plug in the CV-in, the module switches to continuous quantizer mode, Gate-out sending midi clock date
– Plug in the Gate-in as well and you have a gated quantizer
– Plug in the gate-in only and it is used to randomly transpose the output pitch.But of course much more is possible.

These I/O functions are currently supported:
CV out: microtonal pitch, velocity chan1, velocity chan 1/2, after touch chan 1/2
Gate out: Midi gate, midi clock, midi start/stop, pass from input
CV in: map to pitch, transpose chan 1/2, shift scale chan 1/2
Gate in: quantizer trigger, quantizer gate, measure frequency, trigger random transpose chan 1/2

Technical data

  • Printed aluminium front panel, 2mm thickness
  • Supply voltage: +-12V and/or +-15V
  • Supply current: +12V: 50mA (depending on the SD card up to 100mA), -12V: 15mA, 5V: 0mA
  • Dimensions: 3HE, 8HP, 128.5mm x 40mm, Depth: < 30mm (including power connector)
  • 16Bit DAC, resolution ~0.15mV or 0.2cents
  • Input / output voltage range 0..10V (10 octaves)
  • Digital outputs: 0V/5V
  • Digital inputs 0..15V (High at about 1.5V)
  • 1.3” 128×64 OLED display
  • Weight: ??

Planned features

Here are a few of the futures we are planning to implement:
– Automatic VCO calibration
– Live pitch matching using closed loop approach
– Support KBM keyboard mapping files
– Midi to microtonal midi conversion
– Send/ Receive midi tuning dumps
– Switch scales via CV in
– A favourite directory for your scales
– Different scales for each channel
– Internal LFO
– Internal arpeggiator
– Extension module with 2 more channels, chainable
– and more …

User manual

A complete user manual for Tubbutec µTune can be found as pdf here:

µTune user manual v1.0 (PDF)

Order online

µTune can be ordered online in our shop.