alwayson — Activates the indicated instrument in the orchestra header, without need for an i statement.
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.
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.
Here is an example of the alwayson opcode. It uses the file alwayson.csd.
Example 49. 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>