You will probably want to use vdelay and an LFO to control the delay time.
There's an example for vdelay in the manual.
The opcode vdelayx will give better interpolation, and sounds better
if you're doing dramatic modulation effects.
For a fat chorus you could add up several LFO/vdelay(x) in parallel,
offsetting the phase of the LFO for each. E.g. a quadrature chorus
would use 4 LFO's each phase offset by 0.25, and each controlling the
delay time for a vdelay. The amount of delay mod (the amplitude of the
LFOs) will control the depth of the effect.
Phaser, flanger, and chorus effects use very similar dsp setups, with
the delay time offset and the modulation amount being the most
important difference between them.

Oeyvind

2008/3/26, basshead6949 <basshead6949@hotmail.com>:
>
> Greetings all, A very basic question for you here, please excuse my
> ignorance.
>
> I'm using MacCsound 1.3 beta so I'm basically studying in the stone age. I
> need to create a chorus effect unit which I would like to include: the
> ability to change the waveform of the LFO, an intensity (how many
> instruments appear to be playing) fader and wet and dry controls. I noticed
> there is no opcode for this and I am not quite sure how to go about it.
>
> Should I somehow link delay and LFO effects together?
>
> What else does chorus need to function professionally?
>
> This is part of my coursework at University so any reply would be greatly
> appreciated
>
> D
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