vbapzmove
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## vbapzmove

vbapzmove — Writes a multi-channel audio signal to a ZAK array with moving virtual sources.

## Description

Writes a multi-channel audio signal to a ZAK array with moving virtual sources.

## Syntax

    vbapzmove inumchnls, istartndx, asig, idur, ispread, ifldnum, ifld1, \
          ifld2, [...]

## Initialization

inumchnls -- number of channels to write to the ZA array. Must be in the range 2 - 256.

istartndx -- first index or position in the ZA array to use

idur -- the duration over which the movement takes place.

ispread -- spreading of the virtual source (range 0 - 100). If value is zero, conventional amplitude panning is used. When ispread is increased, the number of loudspeakers used in panning increases. If value is 100, the sound is applied to all loudspeakers.

ifldnum -- number of fields (absolute value must be 2 or larger). If ifldnum is positive, the virtual source movement is a polyline specified by given directions. Each transition is performed in an equal time interval. If ifldnum is negative, specified angular velocities are applied to the virtual source during specified relative time intervals (see below).

ifld1, ifld2, ... -- azimuth angles or angular velocities, and relative durations of movement phases (see below).

## Performance

asig -- audio signal to be panned

The opcode vbapzmove is the multiple channel analog of the opcodes like vbap4move, working on inumchnls and using a ZAK array for output.

| Warning
Please note that all vbap panning opcodes require the vbap system to be initialized using vbaplsinit.

## Examples

See the entry for vbap8move for an example of usage of the vbapXmove opcodes.

## Reference

Ville Pulkki: “Virtual Sound Source Positioning Using Vector Base Amplitude Panning” Journal of the Audio Engineering Society, 1997 June, Vol. 45/6, p. 456.

## See also

Panning and Spatialization: Vector Base Amplitude Panning

## Credits

John ffitch
University of Bath/Codemist Ltd.
Bath, UK
May 2000

New in Csound Version 4.07

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