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Peti Indian Harmonium VST/AU Plugin

October 2015 : 2.1 update: 64-bit for all platforms. Already a Peti user? The update is free please ask to

Peti - Harmonium / Reed Organ Emulation    VSTVSTAU

Peti is a unique VSTi, which uses hybrid FM synthesis technology to emulate the sounds of the Harmonium, a member of the Reed Organ family, also known as "pump organ".
The Harmonium in its smaller form is widely used in north Indian music and, as derivation, in pop and rock music too for its full and sweet sound.

Peti is capable of emulating a wide variety of reed organ variations, as well as timbres which resemble instruments from accordians to pipe organs, and even the famous melodicas of reggae dub music.

Peti allows the user control over the emulated Bellows mechanism, with 11 different modes providing 'automatic' or manual pumping and appropriate modulation. It also includes two separate 'reed banks' for the widest possible range of reed organ timbres from its hybrid synthesis system.

Peti also emulates various features of the Harmonium, including the noise of air in the bellows and chambers, a 'musette' tremolo feature, and 'key coupling' allowing a single note to trigger two voices.

Peti provides full MIDI Learn features for each of its controls. Download the Demo Version now, including preset bank and help manual.


Reed Banks 1 & 2 Controls

There are two Reed Banks modelled in Peti, with the same parameters available independently for each Bank.
These Reed Banks are responsible for the basic timbre of the instrument. However the two Reed Banks are not identical, which means that swapping settings between Bank 1 and Bank 2 may change the overall sound. 

Parameters are:
- Brighter : Adds more high frequencies in the timbre.
- Harmonics: Two different harmonic 'flavours' for each Reed Bank.
- Modulation: This parameter controls the overall amount of harmonics added.

Global Controls

Resonance: This parameter sets how much physical resonance is modelled to simulate the wooden body of the Harmonium.
Chorus: This parameter controls the effect which is often called 'musette' or 'tremolo' in accordian terminology.
Ratio: This parameter changes the pitch difference between the two Reed Banks.
Breath: This parameter controls the amount of 'air noise'.
Keys: This parameter controls the amount of keyboard noise simulated.

Volume: This parameter controls the output level of Peti.
Pitch: This parameter controls the master fine-tuning setting.
Velocity Sensivity: This parameter allows you to adjust the instrument's response to MIDI velocity.
MaxVoices: This parameter sets the polyphony of Peti, from 1 (mono legato) to 16.
Keyboard Coupler: This control emulates a mechanical 'coupler' which is found in some Harmoniums. It causes two notes to be played simultaneously by one key, with an interval which may be set to an octave, a fourth, or a fifth.
Scale Changer: This control shifts the keyboard pitch up to 5 semitones up or down. This allows the player to change key but retain the same fingering, e.g. to play Eb major scale all on white keys.

The license allows you to receive
software updates for free and to
obtain free support for the
Peti VSTi.

download trial


full size screenshot

1. Harmonium solo,
2 minutes improvvisation on
Peti only 1.9 MB

2. Peti Crazy Tango,
2 istances of Peti sequenced with
a beat box 1.6 MB

3. Peti Melodica Short Dub,
simple example with bass and
drums 924 KB

4. "This Night"
song by Garret Gengler, using
Peti in a full mix 1.5 MB

5. Peti as Jazz accordion,
(bass and guitar by HarpTime Fun)
1.1 MB

6. Peti Swing Theme,
another but faster Jazz accordion
611 KB

and don't miss
Damien playing!
Suggested songs with Peti
S Hora and Puzze Nign
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