The Chorus module series is made with 2 modules, the mono version and stereo version of a great classical chorus. With this chorus you can emulate this gear effects and lose almost no CPU.

It is very optimized and use normalized delay lines. On the Stereo modules a quadrature phase algorithm does an impressive mix of the left and right 2.

This is a simple one voice chorus, multiple voice chorus will be released later.

Definition : "The algorithm behind the chorus effect isn't a spectacular or amazing trick - it's actually fairly simple. What happens when two people play instruments in unison? Well they are not always playing in precise synchronization, so there is some delay between the sounds they produce. In addition, the pitch of the two instruments can deviate somewhat, despite careful tuning. These are the functions that your chorus effect is reproducing."

• 32 bits processing.

• low CPU usage (less than 1% on an Althon 1.8ghz).

• 2 version Mono, and Stereo.

• Support any sound card frequencies (up to 196Khz)

• Automatic turn to sleep mode and save CPU if no signal comes.

Input left : connect your input signal to this pin. In the mono version the output is stereo. That's how chorus is working. The delay lines are used to spread the signal in the stereo space.

Input right : do the same job as the Input right. In the stereo version the 4 outputs (2 stereo outputs because each channel is processed separately) are recombined together with a 90° phase shift.

Depth : The sweep depth controls how much the total delay time changes over time. It is expressed in samples. So to calculate the number of milliseconds you have to divide the Depth value by the frequency (ex: Depth / 44100) .

This Chorus uses only a sine LFO waveform internally to modulate the delay lines.

Frequency : The Frequency control is pretty straightforward. This parameter refers to the rate at which the LFO waveform repeats itself, and it also is a factor in the pitch modulation. 

The stereo chorus is constructed by running two monophonic chorus run in quadrature phase. This simply means that the LFO in each monophonic chorus differ in phase by ninety degrees (or one-quarter of a wavelength). This technique creates a 'wider' sound because the sound arriving at each of your ears is different.

Mix : means the % of effect and dry sound in the final result. 0 means only the dry sound. 1 = only the effect.

Here is how to use this effect (the stereo one). 2 examples are included in the distribution.