The Alternative Csound Reference Manual
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# lpshold

lpshold -- Generate control signal consisting of held segments.

## Description

Generate control signal consisting of held segments delimited by two or more specified points. The entire envelope is looped at kfreq rate. Each parameter can be varied at k-rate.

## Syntax

ksig lpshold kfreq, ktrig, ktime0, kvalue0 [, ktime1] [, kvalue1] [, ktime2] [, kvalue2] [...]

## Performance

ksig -- Output signal

kfreq -- Repeat rate in Hz or fraction of Hz

ktrig -- If non-zero, retriggers the envelope from start (see trigger opcode), before the envelope cycle is completed.

ktime0...ktimeN -- Times of points; expressed in fraction of a cycle

kvalue0...kvalueN -- Values of points

lpshold is similar to loopseg, but can generate only horizontal segments, i.e. holds values for each time interval placed between ktimeN and ktimeN+1. It can be useful, among other things, for melodic control, like old analog sequencers.

## Examples

Here is an example of the lpshold opcode. It uses the files lpshold.orc and lpshold.sco.

Example 1. Example of the lpshold opcode.

    /* lpshold.orc */
    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1
    instr 1
      kfreq line 1, p3, 20

      klp lpshold kfreq, 0, 0, 0, p3*0.25, 20000, p3*0.75, 0

      a1 oscil klp, 440, 1
      out a1
    endin
    /* lpshold.orc */

    /* lpshold.sco */
    ; Table #1, a sine wave.
    f 1 0 16384 10 1

    ; Play Instrument #1 for five seconds.
    i 1 0 5
    e
    /* lpshold.sco */

## See Also

loopseg

## Credits

Author: Gabriel Maldonado

New in Version 4.13

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