STKStifKarp
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## STKStifKarp

STKStifKarp — STKStifKarp is a plucked stiff string instrument.

## Description

STKStifKarp is a plucked stiff string instrument. It a simple plucked string algorithm (Karplus Strong) with enhancements, including string stiffness and pluck position controls. The stiffness is modeled with allpass filters.

## Syntax

    asignal STKStifKarp ifrequency, iamplitude, [kc1, kv1[, kc2, kv2[, kc3, kv3]]]

## Initialization

ifrequency -- Frequency of note played, in Hertz.

iamplitude -- Amplitude of note played (range 0-1).

## Performance

kc1, kv1, kc2, kv2, kc3, kv3, kc4, kv4, kc5, kv5, kc6, kv6, kc7, kv7, kc8, kv8 -- Up to 8 optional k-rate controller pairs for the STK opcodes. Each controller pair consists of a controller number (kc) followed by a controller value (kv). The 3 controller numbers and values that work for STKStifKarp are:

- kc, kv -- 4, pickup position.

- kc, kv -- 11, string sustain.

- kc, kv -- 1, string stretch.

| Note
The code for this opcode is taken directly from the StifKarp class in the Synthesis Toolkit in C++ by Perry R. Cook and Gary P. Scavone. More on the STK classes can be found here: https://ccrma.stanford.edu/software/stk/classes.html

## Examples

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

Example 787. Example of the STKStifKarp opcode.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac     ;;;RT audio out
    ;-iadc    ;;;uncomment -iadc if RT audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o STKStifKarp.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs = 1

    instr 1

    ifrq	=	p4
    kpos	line	p6, p3, p7				;Pickup Position
    ksus	=	p5					;String Sustain

    asig	STKStifKarp cpspch(p4), 1, 4, kpos, 11, ksus, 1, 10
    	outs asig, asig
    endin

    </CsInstruments>
    <CsScore>

    i 1 0  2  5.00 0  100 100
    i 1 +  40 5.00 127 1  127
    i 1 10 32 5.00 127 1  10
    e
    </CsScore>
    </CsoundSynthesizer>

## Credits

Author: Michael Gogins (after Perry Cook)
Irreducible Productions
New York, NY

New in Csound version 5.11

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