alwayson
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## alwayson

alwayson — Activates the indicated instrument in the orchestra header, without need for an i statement.

## Description

Plugin opcode in signalflowgraph

Activates the indicated instrument in the orchestra header, without need for an i statement. Instruments must be activated in the same order as they are defined.

The alwayson opcode is designed to simplify the definition of re-usable orchestras with signal processing or effects chains and networks.

## Syntax

     alwayson Tinstrument [p4, ..., pn]

## Initialization

Tinstrument -- String name of the instrument definition to be turned on.

[p4, ..., pn] -- Optional pfields to be passed to the instrument, in the same order and type as if this were an i statement.

When the instrument is activated, p1 is the insno, p2 is 0, and p3 is -1. Pfields from p4 on may optionally be sent to the instrument.

## Examples

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

Example 56. Example of the alwayson 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:
    ;-Wfo alwayson.wav
    </CsOptions>
    <CsInstruments>

    ; Initialize the global variables.

    sr     = 44100
    ksmps 	= 32
    nchnls 	= 2

    ; Connect up instruments and effects to create the signal flow graph.

    connect "SimpleSine",   	"leftout",     "Reverberator",     	"leftin"
    connect "SimpleSine",   	"rightout",    "Reverberator",     	"rightin"

    connect "Moogy",        	"leftout",     "Reverberator",     	"leftin"
    connect "Moogy",        	"rightout",    "Reverberator",     	"rightin"

    connect "Reverberator", 	"leftout",     "Compressor",       	"leftin"
    connect "Reverberator", 	"rightout",    "Compressor",       	"rightin"

    connect "Compressor",   	"leftout",     "Soundfile",       	"leftin"
    connect "Compressor",   	"rightout",    "Soundfile",       	"rightin"

    ; Turn on the "effect" units in the signal flow graph.

    alwayson "Reverberator", 0.91, 12000
    alwayson "Compressor"
    alwayson "Soundfile"

    ; Define instruments and effects in order of signal flow.

    			    instr SimpleSine
                    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    			    ; Default values:   p1  p2  p3  p4  p5  p6  p7  p8  p9  p10
    			    pset			    0,  0,  10, 0,  0,  0,  0.5
    iattack			=			        0.015
    idecay			=			        0.07
    isustain		=			        p3
    irelease		=			        0.3
    p3			    =			        iattack + idecay + isustain + irelease
    adamping		linsegr			    0.0, iattack, 1.0, idecay + isustain, 1.0, irelease, 0.0
    iHz 			= 			        cpsmidinn(p4)
                    ; Rescale MIDI velocity range to a musically usable range of dB.
    iamplitude 		= 			        ampdb(p5 / 127 * 15.0 + 60.0)
    			    ; Use ftgenonce instead of ftgen, ftgentmp, or f statement.
    icosine			ftgenonce 		    0, 0, 65537, 11, 1
    aoscili			oscili 			    iamplitude, iHz, icosine
    aadsr 			madsr 			    iattack, idecay, 0.6, irelease
    asignal 		= 			        aoscili * aadsr
    aleft, aright	pan2			    asignal, p7
    			    ; Stereo audio output to be routed in the orchestra header.
    			    outleta 		    "leftout", aleft
    			    outleta 		    "rightout", aright
    			    endin

    			    instr Moogy
                    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    			    ; Default values:   p1  p2  p3  p4  p5  p6  p7  p8  p9  p10
    			    pset			    0,  0,  10, 0,  0,  0,  0.5
    iattack			=			        0.003
    isustain		=			        p3
    irelease		=			        0.05
    p3			    =			        iattack + isustain + irelease
    adamping		linsegr			    0.0, iattack, 1.0, isustain, 1.0, irelease, 0.0
    iHz 			= 			        cpsmidinn(p4)
                    ; Rescale MIDI velocity range to a musically usable range of dB.
    iamplitude 		= 			        ampdb(p5 / 127 * 20.0 + 60.0)
    			    print 			    iHz, iamplitude
    			    ; Use ftgenonce instead of ftgen, ftgentmp, or f statement.
    isine 			ftgenonce 		    0, 0, 65537, 10, 1
    asignal 		vco 			    iamplitude, iHz, 1, 0.5, isine
    kfco 			line 			    2000, p3, 200
    krez 			= 			        0.8
    asignal 		moogvcf 		    asignal, kfco, krez, 100000
    asignal			=			        asignal * adamping
    aleft, aright	pan2			    asignal, p7
    			    ; Stereo audio output to be routed in the orchestra header.
    			    outleta 		    "leftout", aleft
    			    outleta 		    "rightout", aright
    			    endin
    			    instr Reverberator
                    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    			    ; Stereo input.
    aleftin 		inleta 			    "leftin"
    arightin 		inleta 			    "rightin"
    idelay 			= 			        p4
    icutoff 		= 			        p5
    aleft, aright 	reverbsc 	        aleftin, arightin, idelay, icutoff
    			    ; Stereo output.
    			    outleta 	        "leftout", aleft
    			    outleta 	        "rightout", aright
    			    endin

    			    instr Compressor
                    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    			    ; Stereo input.
    aleftin 		inleta 		        "leftin"
    arightin 		inleta 		        "rightin"
    kthreshold 		= 		            25000
    icomp1 			= 		            0.5
    icomp2 			= 		            0.763
    irtime 			= 		            0.1
    iftime 			= 		            0.1
    aleftout 		dam 		        aleftin, kthreshold, icomp1, icomp2, irtime, iftime
    arightout 		dam 		        arightin, kthreshold, icomp1, icomp2, irtime, iftime
    			    ; Stereo output.
    			    outleta 	        "leftout", aleftout
    			    outleta 	        "rightout", arightout
    			    endin

    			    instr Soundfile
                    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    			    ; Stereo input.
    aleftin 		inleta 		        "leftin"
    arightin 		inleta 		        "rightin"
    			    outs 		        aleftin, arightin
    			    endin

    </CsInstruments>
    <CsScore>

    ; It is not necessary to activate "effects" or create f-tables in the score!
    ; Overlapping notes create new instances of instruments with proper connections.

    i "SimpleSine" 1 5 60 85
    i "SimpleSine" 2 5 64 80
    i "Moogy" 3 5 67 75
    i "Moogy" 4 5 71 70
    ; 1 extra second after the performance
    e 1

    </CsScore>
    </CsoundSynthesizer>

## See also

Signal Flow Graph Opcodes

## Credits

By: Michael Gogins 2009

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