partikkelsync
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## partikkelsync

partikkelsync — Outputs partikkel's grain scheduler clock pulse and phase to synchronize several instances of the partikkel opcode to the same clock source.

## Description

partikkelsync is an opcode for outputting partikkel's grain scheduler clock pulse and phase. partikkelsync's output can be used to synchronize other instances of the partikkel opcode to the same clock.

## Syntax

    async [,aphase] partikkelsync iopcode_id

## Initialization

iopcode_id -- the opcode id, linking an instance of partikkel to an instance of partikkelsync.

## Performance

async -- trigger pulse signal. Outputs trigger pulses synchronized to a partikkel opcode's grain scheduler clock. One trigger pulse is generated for each grain started in the partikkel opcode with the same opcode_id. The normal usage would be to send this signal to another partikkel opcode's async input to synchronize several instances of partikkel.

aphase -- clock phase. Outputs a linear ramping phase signal. Can be used e.g. for softsynchronization, or just as a phase generator ala phasor.

## Example

Here is an example of the partikkelsync opcodes. It uses the file partikkelsync.csd.

Example 739. Example with soft sync of two partikkel generators.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    ; Audio out
    -odac           ;;;RT audio
    ; For Non-realtime ouput leave only the line below:
    ; -o partikkel_softsync.wav -W ;;; for file output any platform
    </CsOptions>

    <CsInstruments>

    sr = 44100
    ksmps = 20
    nchnls = 2

    ; Example by Oeyvind Brandtsegg 2007, revised 2008

    giSine		ftgen	0, 0, 65537, 10, 1
    giCosine	ftgen	0, 0, 8193, 9, 1, 1, 90
    giSigmoRise	ftgen		0, 0, 8193, 19, 0.5, 1, 270, 1			; rising sigmoid
    giSigmoFall	ftgen		0, 0, 8193, 19, 0.5, 1, 90, 1			; falling sigmoid

    ; *************************************************
    ; example of soft synchronization of two partikkel instances
    ; *************************************************
    	instr 1

    /*score parameters*/
    igrainrate	= p4		; grain rate
    igrainsize	= p5		; grain size in ms
    igrainFreq	= p6		; fundamental frequency of source waveform
    iosc2Dev	= p7		; partikkel instance 2 grain rate deviation factor
    iMaxSync	= p8		; max soft sync amount (increasing to this value during length of note)

    /*overall envelope*/
    iattack		= 0.001
    idecay		= 0.2
    isustain	= 0.7
    irelease	= 0.2
    amp		linsegr	0, iattack, 1, idecay, isustain, 1, isustain, irelease, 0

    kgrainfreq	= igrainrate		; grains per second
    kdistribution	= 0			; periodic grain distribution
    idisttab	= -1			; (default) flat distribution used
                                            ; for grain distribution
    async		= 0			; no sync input
    kenv2amt	= 0			; no secondary enveloping
    ienv2tab	= -1			; default secondary envelope (flat)
    ienv_attack	= giSigmoRise		; default attack envelope (flat)
    ienv_decay	= giSigmoFall		; default decay envelope (flat)
    ksustain_amount	= 0.3			; time (in fraction of grain dur) at
                                            ; sustain level for each grain
    ka_d_ratio	= 0.2 			; balance between attack and decay time
    kduration	= igrainsize		; set grain duration in ms
    kamp		= 0.2*0dbfs 		; amp
    igainmasks	= -1			; (default) no gain masking
    kwavfreq	= igrainFreq		; fundamental frequency of source waveform
    ksweepshape	= 0			; shape of frequency sweep (0=no sweep)
    iwavfreqstarttab = -1			; default frequency sweep start
                                            ; (value in table = 1, which give
                                            ; no frequency modification)
    iwavfreqendtab	= -1			; default frequency sweep end
                                            ; (value in table = 1, which give
                                            ; no frequency modification)
    awavfm		= 0			; no FM input
    ifmamptab	= -1			; default FM scaling (=1)
    kfmenv		= -1			; default FM envelope (flat)
    icosine		= giCosine		; cosine ftable
    kTrainCps	= kgrainfreq		; set trainlet cps equal to grain
                                            ; rate for single-cycle trainlet in
                                            ; each grain
    knumpartials	= 3			; number of partials in trainlet
    kchroma		= 1			; balance of partials in trainlet
    ichannelmasks	= -1			; (default) no channel masking,
                                            ; all grains to output 1
    krandommask	= 0			; no random grain masking
    kwaveform1	= giSine		; source waveforms
    kwaveform2	= giSine		;
    kwaveform3	= giSine		;
    kwaveform4	= giSine		;
    iwaveamptab	= -1			; mix of 4 source waveforms and
                                            ; trainlets (set to default)
    asamplepos1	= 0			; phase offset for reading source waveform
    asamplepos2	= 0			;
    asamplepos3	= 0			;
    asamplepos4	= 0			;
    kwavekey1	= 1			; original key for source waveform
    kwavekey2	= 1			;
    kwavekey3	= 1			;
    kwavekey4	= 1			;
    imax_grains	= 100			; max grains per k period
    iopcode_id	= 1			; id of opcode, linking partikkel
                                            ; to partikkelsync

    a1  partikkel kgrainfreq, kdistribution, idisttab, async, kenv2amt, \
           ienv2tab,ienv_attack, ienv_decay, ksustain_amount, ka_d_ratio, \
           kduration, kamp, igainmasks, kwavfreq, ksweepshape, \
           iwavfreqstarttab, iwavfreqendtab, awavfm, ifmamptab, kfmenv, \
           icosine, kTrainCps, knumpartials, kchroma, ichannelmasks, \
           krandommask, kwaveform1, kwaveform2, kwaveform3, kwaveform4, \
           iwaveamptab, asamplepos1, asamplepos2, asamplepos3, asamplepos4, \
           kwavekey1, kwavekey2, kwavekey3, kwavekey4, imax_grains, iopcode_id

    async1		partikkelsync	iopcode_id   ; clock pulse output of the
                                                 ; partikkel instance above
    ksyncGravity 	line 0, p3, iMaxSync	     ; strength of synchronization
    aphase2		init 0
    asyncPolarity	limit (int(aphase2*2)*2)-1, -1, 1
    ; use the phase of partikkelsync instance 2 to find sync
    ; polarity for partikkel instance 2.
    ; If the phase of instance 2 is less than 0.5, we want to
    ; nudge it down when synchronizing,
    ; and if the phase is > 0.5 we want to nudge it upwards.
    async1		= async1*ksyncGravity*asyncPolarity  ; prepare sync signal
                                                      ; with polarity and strength

    kgrainfreq2	= igrainrate * iosc2Dev		; grains per second for second partikkel instance
    iopcode_id2	= 2
    a2 partikkel kgrainfreq2, kdistribution, idisttab, async1, kenv2amt, \
           ienv2tab, ienv_attack, ienv_decay, ksustain_amount, ka_d_ratio, \
           kduration, kamp, igainmasks, kwavfreq, ksweepshape, \
           iwavfreqstarttab, iwavfreqendtab, awavfm, ifmamptab, kfmenv, \
           icosine, kTrainCps, knumpartials, kchroma, ichannelmasks, \
           krandommask, kwaveform1, kwaveform2, kwaveform3, kwaveform4, \
           iwaveamptab, asamplepos1, asamplepos2, asamplepos3, \
           asamplepos4, kwavekey1, kwavekey2, kwavekey3, kwavekey4, \
           imax_grains, iopcode_id2

    async2, aphase2	partikkelsync	iopcode_id2
    ; clock pulse and phase
    ; output of the partikkel instance above,
    ; we will only use the phase

    outs	a1*amp, a2*amp

    endin

    </CsInstruments>
    <CsScore>

    /*score parameters
    igrainrate	= p4		; grain rate
    igrainsize	= p5		; grain size in ms
    igrainFreq	= p6		; frequency of source wave within grain
    iosc2Dev	= p7		; partikkel instance 2 grain rate deviation factor
    iMaxSync	= p8		; max soft sync amount (increasing to this value during length of note)
    */
    ;		GrRate	GrSize	GrFund	Osc2Dev	MaxSync

    i1 0 	10	2	20	880	1.3	0.3
    s
    i1 0 	10	5	20	440	0.8	0.3
    s
    i1 0 	6	55	15	660	1.8	0.45
    s
    i1 0 	6	110	10	440	0.6	0.6
    s
    i1 0 	6	220	3	660	2.6	0.45
    s
    i1 0 	6	220	3	660	2.1	0.45
    s
    i1 0 	6	440	3	660	0.8	0.22
    s

    e

    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

Granular Synthesis

## Credits

Author: Thom Johansen
Author: Torgeir Strand Henriksen
Author: Øyvind Brandtsegg
April 2007

New in version 5.06

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