Trade-in your used gear for store credit!

Reminder! We accept Bitcoin!

Modular and Beyond Since 2008

Product form

Instruo - Tanh [3]

  • HP: 4

Instruo - Tanh [3] tanh[3] is a three channel, all analogue, wave shaper. It takes an input signal and outputs... Read more Read more

$165.00Excl. VAT


      Instruo - Tanh [3]

      tanh[3] is a three channel, all analogue, wave shaper. It takes an input signal and outputs the hyperbolic tangent function [tanh(x)] for that signal.

      In more useful terms, it adds curves to a signal!

      Traditionally the circuit is used to shape a triangle wave to a sine but when used with more complex signals it behaves as a single knob limiter.


      The tanh has three independent channels for wave shaping.

      For many Max/MSP and/or PD users, the [tanh~] object may be familiar. It is likely a much used secret weapon in many contexts!

      Describing what the tanh does to a signal, both mathematically and sonically can be a headache, and not particularly useful. So I will describe some particularly fun use cases to give a bit of context.


      Feedback control:

      Feedback is fun. But feedback can get unpredictable.

      The user can insert tanh in the feedback path and use it to reign in runaway feedback. Whether it’s feedback in a delay loop, a reverb, filter or straight up microphonic

      In this context, it functions as a limiter on feedback amplitude.

      Instead of fading away to silence, when longer sustain is desired, or running away uncontrollably, a signal can be controlled much more easily with a tanh. There will be a much wider range at which a feedback oscillation will stabilise musically.


      Wave shaping:

      Running a triangle wave through a tanh will allow for some interesting wave shape control

      Fully CCW and the resulting signal will be a slightly attenuated pass through of the original triangle wave. As the level is increased, the corners will soften and the waveform will shape into a sine wave.

      When a level has increased the sine will soft clip and eventually settle into a unique peaked waveform.



      tanh reacts very well when the user runs a complex audio signal through one of the channels. Drum voices especially!

      The effect is sonically similar to compression but achieved through wave shaping as opposed to gain reduction. Limiting is a more appropriate description but it definitely has its own unique characteristic.

      Increasing the level will introduce soft clipping distortion/overdrive.

      Depth: 27mm

      +12V: 15mA
      –12V: 10mA

      Back to top