instr
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## instr

instr — Starts an instrument block.

## Description

Starts an instrument block.

## Syntax

    instr i, j, ...

## Initialization

Starts an instrument block defining instruments i, j, ...

i, j, ... must be numbers or names, not expressions. Any positive integer is legal, and in any order, but excessively high numbers are best avoided.

| Note
There may be any number of instrument blocks in an orchestra.

Instruments can be defined in any order (but they will always be both initialized and performed in ascending instrument number order, with the exception of notes triggered by real time events that are initialized in the order of being received but still performed in ascending instrument number order). Instrument blocks cannot be nested (i.e. one block cannot contain another).

For more information on named instruments, see Named Instruments.

## Examples

Here is an example of the instr opcode. It uses the file instr.csd.

Example 479. Example of the instr opcode.

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

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    ; Audio out   Audio in
    -odac           -iadc    ;;;RT audio I/O
    ; For Non-realtime ouput leave only the line below:
    ; -o instr.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1.
    instr 1
      iamp = 10000
      icps = 440
      iphs = 0

      a1 oscils iamp, icps, iphs
      out a1
    endin

    </CsInstruments>
    <CsScore>

    ; Play Instrument #1 for 2 seconds.
    i 1 0 2
    e

    </CsScore>
    </CsoundSynthesizer>

## See also

Instrument and Opcode Block Statements

## Credits

Example written by Kevin Conder.

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