vstparamset,vstparamget
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## vstparamset,vstparamget

vstparamset — Used for parameter comunication to and from a VST plugin.

## Syntax

    vstparamset instance, kparam, kvalue

    kvalue vstparamget instance, kparam

## Description

vstparamset and vstparamget are used for parameter comunication to and from a VST plugin.

## Initialization

instance - the number which identifies the plugin, to be passed to other vst4cs opcodes.

## Performance

kparam - The number of the parameter to set or get.

kvalue - the value to set, or the the value returned by the plugin.

Parameters vary according to the plugin. To find out what parameters are available, use the verbose option when loading the plugin with vstinit. Note that the VST protocol specifies that all parameter values must lie between 0.0 and 1.0, inclusive.

## Examples

Here is an example of the use of the vstparamset opcode. It uses the file vst4cs.csd.

Example 930. Example of the vstparamset opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Credits: Adapted by Michael Gogins
    ; from code by David Horowitz and Lian Cheung.
    ; The "--displays" option is required in order for
    ; the Pianoteq GUI to dispatch events and display properly.
    -m3 --displays -odac
    </CsOptions>
    <CsInstruments>
    sr     = 44100
    ksmps  = 20
    nchnls = 2
                    ; Load the Pianoteq into memory.
    gipianoteq      vstinit      "C:\\Program Files\\Steinberg\\VstPlugins\\Pianoteq 3.0 Trial\\Pianoteq30 Trial.dll", 1

                    ; Print information about the Pianoteq, such as parameter names and numbers.
                    vstinfo      gipianoteq

                    ; Open the Pianoteq's GUI.
                    vstedit      gipianoteq

                    ; Send notes from the score to the Pianoteq.
                    instr 1
                    ; MIDI channels are numbered starting at 0.
                    ; p3 always contains the duration of the note.
                    ; p4 contains the MIDI key number (pitch),
                    ; p5 contains the MIDI velocity number (loudness),
    imidichannel    init         0
                    vstnote      gipianoteq, imidichannel, p4, p5, p3
                    endin

                    ; Send parameter changes to the Pianoteq.
                    instr 2
                    ; p4 is the parameter number.
                    ; p5 is the parameter value.
                    vstparamset  gipianoteq, p4, p5
                    endin

                    ; Send audio from the Pianoteq to the output.
                    instr 3
    ablankinput     init         0
    aleft, aright   vstaudio     gipianoteq, ablankinput, ablankinput
                    outs         aleft, aright
                    endin

    </CsInstruments>
    <CsScore>
    ; Turn on the instrument that receives audio from the Pianoteq indefinitely.
    i 3 0 -1
    ; Send parameter changes to Pianoteq before sending any notes.
    ; NOTE: All parameters must be between 0.0 and 1.0.
    ; Length of piano strings:
    i 2 0 1 33 0.5
    ; Hammer noise:
    i 2 0 1 25 0.1
    ; Send a C major 7th arpeggio to the Pianoteq.
    i 1 1 10 60 76
    i 1 2 10 64 73
    i 1 3 10 67 70
    i 1 4 10 71 67
    ; End the performance, leaving some time
    ; for the Pianoteq to finish sending out its audio,
    ; or for the user to play with the Pianoteq virtual keyboard.
    e 20
    </CsScore>
    </CsoundSynthesizer>

## Credits

By: Andrés Cabrera and Michael Gogins

Uses code from Hermann Seib's VSTHost and Thomas Grill's vst~ object.

VST is a trademark of Steinberg Media Technologies GmbH. VST Plug-In Technology by Steinberg.

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