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Om patches

Om is a modular synth written by Dave Robillard where you use LADSPA and DSSI plugins to build synthesis networks (patches), which can receive and send audio data to the JACK sound daemon. It can also be controlled by the ALSA sequencer, so you can use your keyboard or sequencer to play these networks.

Below are some Om patches that I have made. I have divided them into two groups; synths, which are instruments that you can connect some control modules to and start playing right away, and components, which are useful subpatches that you can use when you are building your own instruments. Have fun, and feel free to send any comments to larsl@users.sourceforge.net.

Components

Slide note

This is a wrapper for the Om note module which is meant to be used as a subpatch. It has three audio rate output ports, Frequency, Velocity, and Gate. The values from the Frequency and Velocity ports are the Frequency and Velocity signals from the note module, passed through Slide modules so overlapping notes will tie into each other, while the Gate value is taken directly from the Gate port on the note module. There are also some arithmetic modules that make sure that notes that don't overlap will start at the desired frequency, and not slide from the previous note. The frequency and velocity slide times can be controlled separately using two control rate input ports.

Synths

test

A noisy drone sound with lots of reverb and delay. The brightness can be controlled using MIDI CC 1 (modulation wheel).

Dirty bass

Distorted, resonant bass with controllable brightness. The volume and filter envelopes are velocity sensitive.

Teeth

Four bandlimited sawtooth oscillators passed through three paralell resonant lowpass filters with varying cutoff frequencies. Expensive but a lot of fun. The demo has three instances of this patch playing, with some panning and echo added.

PWM pad

A slightly organ-like bright pad. The demo is recorded with a TAP Reverb between the instrument and the audio outputs. This instrument can be rather CPU heavy if you run it in polyphonic mode.

Sugar

A cute subtractive synth with a square wave oscillator and a highly resonant lowpass filter. The synth is meant to be played in monophonic mode, and if you press a key before you release the previous key the synth will tie the notes together. The volume and the cutoff frequency are velocity sensitive, and the cutoff frequency can be modulated using a control input.