The Alternative Csound Reference Manual
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# vdelayxq

vdelayxq -- A 4-channel variable delay opcode with high quality interpolation.

## Description

A 4-channel variable delay opcode with high quality interpolation.

## Syntax

aout1, aout2, aout3, aout4 vdelayxq ain1, ain2, ain3, ain4, adl, imd, iws [, ist]

## Initialization

aout1, aout2, aout3, aout4 -- output audio signals.

ain1, ain2, ain3, ain4 -- input audio signals.

adl -- delay time in seconds

imd -- max. delay time (seconds)

iws -- interpolation window size (see below)

ist (optional) -- skip initialization if not zero

## Performance

This opcode uses high quality (and slow) interpolation, that is much more accurate than the currently available linear and cubic interpolation. The iws parameter sets the number of input samples used for calculating one output sample (allowed values are any integer multiply of 4 in the range 4 - 1024); higher values mean better quality and slower speed.

The multichannel opcodes (eg. vdelayxq) allow delaying 2 or 4 variables at once (stereo or quad signals); this is much more efficient than using separate opcodes for each channel.

| Notes

- Delay time is measured in seconds (unlike in vdelay and vdelay3), and must be a-rate.

- The minimum allowed delay is iws/2 samples.

- Using the same variables as input and output is allowed in these opcodes.

- In vdelayxw*, changing the delay time has some effects on output volume:

  a = 1 / (1 + dt)

  where a is the output gain, and dt is the change of delay time per seconds.

- These opcodes are best used in the double-precision version of Csound.

## See Also

vdelayx, vdelayxs, vdelayxw, vdelayxwq, vdelayxws

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