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Knobula Pianophonic

¥79,900 (Tax excluded ¥72,636)
A polyphonic synthesizer inspired by the piano sound system.

Format: Eurorack
Width: 12HP
Depth: mm
Current: 100mA @ + 12V, 20mA @ -12V

Manual PDF (English)
Quick Start Guide

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Pianophonic is a powerful hybrid synth engine that combines multi-oscillator wavetables with detailed samples. This synth features 8-voice polyphony, creating a wide range of sounds beyond just piano.The audio architecture is extremely versatile and easy to use, with important controls intuitively located on the front panel. CV input and output are also provided and can be fully integrated within a Eurorack patch.

This synth takes inspiration from the wavetable/sampler keyboards of the 90's and takes a concise and effective approach to digital sound creation, but with high quality 24-bit 48KHz and control over key parameters. Fingertip operation is possible.

Built-in SD card and online utilitiesWaveslicerallows users to create their own wavetables, hammers, and soundbanks, giving endless possibilities for sonic exploration.

How To Use


The explanation of each part is displayed by mouse over


Pianophonic takes inspiration from traditional piano movements, with each voice3 wavetable oscillators (both sides & middle)Hammer sample playback engineEquipped with: This hybrid oscillator combo allows you to create harmonically rich and varied sounds, as well as adding sampled percussion hits at the beginning.
The included SD card contains a number of keymapped wavetables derived from multiple instruments, but the sounds are not limited to piano, but include four acoustic pianos, electric piano, guitar, tuned percussion, and some classical music. Includes a synthesizer, a set of useful harmonic waveforms, and more. You can also create custom sounds yourself by uploading your sounds to Knobula's Waveslicer. These presets can be switched partially or completely using the Part Selector.
Saving presets
You can save your favorite hammer, wavetable, and knob setting combinations to one of 16 different memory slots. To save a preset, first hold Shift and turn the Part Selector knob to the desired number. While holding Shift, press and hold the trigger button until it flashes.
Recalling a preset
Hold down Shift and select a number with the Part Selector, then release Shift to load the saved preset.
Note: Control positions no longer reflect actual sound settings.

By default, the Pianophonic's uSD card stores the following sound libraries, which can be called up using the Part Selector.

To make the Pianophonic sound, send MIDI notes from the MIDI input or send a gate to the Trigger input.

CV assignment

Two CV inputs can be assigned to any parameter. To enter its settings, press and hold the Shift and Voice Mode buttons at the same time for 2 seconds.

CV A (Start Point) assignment Once you enter CV assignment mode, the LED will start blinking. You are now ready to register a new assignment for CV A. To assign CV A, move any knob on the Pianophonic. When you do this, the device will see the new assignment of CV A. The LED behavior will change (blinking faster) to indicate this.

CV B (Chord Select) assignment After assigning CV A, you have two options:

  1. If you also want to assign CV B, move another knob while the LED is flashing. This operation assigns that knob's function to CV B.
  2. If you don't want to assign CV B, just wait. After a short period of time, the LED will stop blinking, indicating that you are out of CV assignment mode. In this case, only CV A will have the new assignment.

CV B only assignment If you want to skip assigning CV A and directly assign CV B, press and hold Shift and Voice Mode for 2 seconds to enter CV assignment mode. When the LED starts blinking, press Shift again. This will skip the assignment of CV A and the LED will start flashing rapidly. Next, move the knob you want to assign to CV B.


The parameters that can be accessed with MIDI CC are:


Wavesliceris an online toolset for creating custom sounds for Pianophonic. This suite is currentlyResynthesisCreate PresetIt consists of two parts. These processes constitute a two-step workflow for generating wavetables from audio files and creating presets for storage on Pianophonic's microSD card.

Resynthesise takes an audio file or set of audio files and converts them into a pair of wavetables and hammers (hammers are samples). Waveslicer automatically calculates the fundamental frequency of an audio file, slices it into a wave table, and extracts the nonharmonic components of the sound as hammer samples.

The explanations of each item and button in the Resynthesise section are as follows.

  • Select Audio File(s) to Process
    Select the file or list of files you want to process.
  • Pitch Detection Method
     - From Audio: Automatically detect the fundamental frequency. Works with most sounds, but is less reliable with metallic or bass sounds.
     - From File Name: Look for the note name within the file name, such as xxxx_C3.wav or xxxx_Ab2.wav. Uses the scientific pitch standard for middle C = C4
  • Hammer Harmonics to Remove
    Select the number of harmonics you want to remove to create a hammer sound from your audio file. The more harmonics are filtered out, the less "harmonic" the hammer sound will be. 0 = no effect, 1-32 = removal of fundamental frequency and N overtones, -1 = removal of all pitch information.
  • Max Length of Hammer
    Adjusts the number of seconds before the hammer sample fades out.
  • Wavetable Phase Smoothing
    It smooths and slices the sound changes into individual waveforms, but at higher settings the temporal detail of the sound can be lost.
  • Upload and process
    This may take a few seconds to a few minutes, depending on your connection speed and the number of files you upload at once. Once the file has been processed, you will be taken to the download section. There you can download the processed file and make any edits or changes before proceeding to stage 2.

Create Preset
Create Preset uses a hammer sound and a wave table file to create a “.pfon” preset for playback from an SD card on the Pianophonic module. You can add a single wave table or load a large number of hammer and wave tables. Waveslicer reads the Hz value based on the pitch detection method used in Resynthesise and automatically zones the sample across the keyboard. If you don't use Waveslicer in the first stage or change the file name, the sounds may not be mapped correctly across the keyboard.

The descriptions of each item and button in the Create Preset section are as follows.

  • Select Hammer Samples
    Select one or more Hammer audio samples in mono 16-bit .wav format.
  • Select Wavetables
    Select one or more waveform tables in N x 2048 waveform format. Wavetable files are typically provided by the Resynthesise feature mentioned above, but can also be obtained from compatible software such as Tone1's Icarus. However, the wave table file name must include the fundamental frequency. Example: SoftPiano_2Hz.wav Otherwise, it will default to C440 (middle C).
  • Preset Template
    Preset template sets the template for the type of sound you want to convert. There are currently two types.Pianoreduces the number of wavetables used and sets the oscillator to sync to the start of the note.Synthinstead leaves the wavetable as is and sets the oscillator to free running. These presets don't strictly have to be used for piano or synth, you can experiment with both presets.
  • Key Resample
    Sets the minimum number of keys that a wavetable/hammer sample will play before it is resampled. This is a trade-off between load time and quality. If you want the wavetable to sound bright across the keyboard, choose a lower number, such as 3. Choose a higher number, such as 12, if you do not want the note to change pitch significantly from the fundamental note. This will only resample each octave, but may result in a dull sound in the lower registers. Higher quality settings increase preset loading time.
  • Pitch Deviation Limit
    Sets the range to which the sample/waveform table is mapped in semitones. This avoids unusable high-pitched bass sounds taking up too much memory and increasing load times.
  • Part Number
    This names the file according to a convention to ensure that the sound is loaded with a specific preset number. This can be easily edited later. Note - Each preset number on the SD card must be unique in the range 1-16. Duplicate numbers will not be loaded.