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connect

Connects a source outlet to a sink inlet.

Plugin opcode in signalflowgraph

The connect opcode, valid only in the orchestra header, sends the signals from the indicated outlet in all instances of the indicated source instrument to the indicated inlet in all instances of the indicated sink instrument. Each inlet instance receives the sum of the signals in all outlet instances. Thus multiple instances of an outlet may fan in to one instance of an inlet, or one instance of an outlet may fan out to multiple instances of an inlet.

When Csound creates a new instance of an instrument template, new instances of its connections also are created.

Syntax

connect Tsource1, Soutlet1, Tsink1, Sinlet1

Initialization

Tsource1 -- String name of the source instrument definition.

Soutlet1 -- String name of the source outlet in the source instrument.

Tsink1 -- String name of the sink instrument definition.

Sinlet1 -- String name of the sink inlet in the sink instrument.

Examples

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

Example of the connect opcode.
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<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 connect.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

/* Written by Michael Gogins */
; Initialize the global variables.
sr = 44100
ksmps = 32
nchnls = 2

; Connect up the instruments to create a 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"

instr SimpleSine
  ihz = cpsmidinn(p4)
  iamplitude = ampdb(p5)
  print ihz, iamplitude
  ; Use ftgenonce instead of ftgen, ftgentmp, or f statement.
  isine ftgenonce 0, 0, 4096, 10, 1
  a1 oscili iamplitude, ihz, isine
  aenv madsr 0.05, 0.1, 0.5, 0.2
  asignal = a1 * aenv
  ; Stereo audio outlet to be routed in the orchestra header.
  outleta "leftout", asignal * 0.25
  outleta "rightout", asignal * 0.75
endin

instr Moogy
  ihz = cpsmidinn(p4)
  iamplitude = ampdb(p5)
  ; Use ftgenonce instead of ftgen, ftgentmp, or f statement.
  isine ftgenonce 0, 0, 4096, 10, 1
  asignal vco iamplitude, ihz, 1, 0.5, isine
  kfco line 200, p3, 2000
  krez init 0.9
  asignal moogvcf asignal, kfco, krez, 100000
  ; Stereo audio outlet to be routed in the orchestra header.
  outleta "leftout", asignal * 0.75
  outleta "rightout", asignal * 0.25
endin

instr Reverberator
  ; Stereo input.
  aleftin inleta "leftin"
  arightin inleta "rightin"
  idelay = p4
  icutoff = p5
  aleftout, arightout reverbsc aleftin, arightin, idelay, icutoff
  ; Stereo output.
  outleta "leftout", aleftout
  outleta "rightout", arightout 
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>
; Not necessary to activate "effects" or create f-tables in the score!
; Overlapping notes to create new instances of instruments.
i "SimpleSine" 1 5 60 85
i "SimpleSine" 2 5 64 80
i "Moogy" 3 5 67 75
i "Moogy" 4 5 71 70
;6 extra seconds after the performance
e 12
</CsScore>
</CsoundSynthesizer>

See also

Signal Flow Graph Opcodes

More information on this opcode: http://www.csoundjournal.com/issue13/signalFlowGraphOpcodes.html, written by Michael Gogins

Credits

By: Michael Gogins 2009