Signal Converters

MNodes uses four signal types (Audio, CV, MIDI, Data) and sometimes you need to convert between them. These nodes bridge the gap.

Audio to CV

Converts an audio signal into a CV (Control Voltage) signal so it can be used for modulation. The audio waveform becomes a modulation source.

Input: Audio Output: CV

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CV to Audio

Converts a CV signal back into audio so you can hear it or process it with audio effects.

Input: CV Output: Audio

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Audio to Data

Samples the audio signal at a configurable rate and outputs the values as Data events. Useful for reading audio levels at a slower rate for UI display or logic.

Parameter	Range	Default	Description
Rate	Hz	—	How many times per second to sample the audio value

Input: Audio Output: Float (Data)

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CV to Data

Samples a CV signal at a configurable rate and outputs it as Data events. Bridges the fast CV world to the slower Data world.

Parameter	Range	Default	Description
Rate	1 - 240 Hz	30 Hz	How many times per second to sample

Input: CV Output: Float (Data)

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MIDI to CV

Converts MIDI note messages into CV signals for controlling oscillators and envelopes. This is the standard way to make oscillators respond to MIDI notes. Monophonic (plays one note at a time, last note has priority).

Input: MIDI

Outputs:

Output	Range	Description
Pitch	V/Oct	Pitch as voltage (C4 = 0V, each semitone = 1/12V)
Gate	0 or 1	High while a note is held, low when released
Velocity	0.0 - 1.0	How hard the note was pressed
Trigger Note On	pulse	Short pulse on each new note
Trigger Note Off	pulse	Short pulse on each note release
Pitch Bend	-1.0 - 1.0	Pitch bend wheel position
Aftertouch	0.0 - 1.0	Pressure after the note is pressed
CC #	0 - 127	Last received CC number
CC Value	0.0 - 1.0	Value of the last received CC
Note Number	0 - 127	Raw MIDI note number
Note Hz	Hz	Frequency of the current note

How to connect it

MIDI In → MIDI To CV → Pitch output → Oscillator Frequency input
                     → Gate output  → Envelope Gate input
                     → Velocity     → VCA / Filter modulation

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Poly MIDI to CV

Like MIDI To CV, but polyphonic. Distributes up to 4 voices across separate outputs. Each voice has its own Pitch, Gate, Velocity, Trigger On, and Trigger Off outputs. Use this to build polyphonic synths.

When more than 4 notes are played, the oldest voice is "stolen" to play the new note.

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MIDI to Data

Extracts values from MIDI messages and outputs them as Data events. Unlike MIDI To CV (which outputs continuous CV signals), this outputs discrete Data events only when a MIDI message is received.

Input: MIDI

Outputs:

Output	Range	Description
Note	0 - 127	Note number of the last note played
Velocity	0.0 - 1.0	Velocity of the last note
Gate	0 or 1	1 while any note is held (tracks polyphonically)
Channel	0 - 15	MIDI channel
CC #	0 - 127	Last received CC number
CC Value	0.0 - 1.0	Value of the last CC
Pitch Bend	-1.0 - 1.0	Pitch bend position
Aftertouch	0.0 - 1.0	Aftertouch pressure

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Note to Frequency

Converts a note name (like "A4") into its frequency in Hz (440.0).

Input: Note name (String) Output: Frequency in Hz (Float)

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dB to Linear / Linear to dB

Converts between decibel values and linear amplitude values.

• Linear to dB: useful for displaying amplitude as dB
• dB to Linear: useful for converting dB settings to amplitude multipliers