> Date: Sun, 26 Jun 2016 01:06:31 +0200
> From: oyvind.brandtsegg@NTNU.NO
> Subject: Re: [Csnd] Interaction Between mxadsr and maxalloc
> To: CSOUND@LISTSERV.HEANET.IE
>
> mmm, just a half-baked idea, but:
> You could use the "active" opcode to read the number of active instances,
> then bypass additional instances (after your allowed number of
> instances) with something like
> kactive active p1
> if kactive > iN then
> turnoff
> endif
> This would duplicate what you already have with maxalloc, then you
> could modify it to allow for extra instances if any instance is in the
> release stage.
> Checking if an instance is in the release stage can be done by:
> xtratim ireleasetime
> krelease release
>
> Actually I'm not sure (don't remember) if active will report an
> instrument active during the release stage, if it does not, then the
> release flag modification is not necessary.
>
> best
> Oeyvind
>
> 2016-06-26 0:23 GMT+02:00 Emmett Palaima <epalaima@berklee.edu>:
> > I'm trying to implement an envelope in my synthesis app, using mxadsr. In
> > the same app I also use maxalloc to limit the number of voices in my
> > synthesizer to prevent it from crashing from receiving to many notes at
> > once.
> >
> > This leads to the problem that since mxadsr adds a release phase to the
> > instrument, an instance in the release phase will still count for maxalloc,
> > meaning the user can't start a new note until all the release phases are
> > over.
> >
> > Does anyone have any advice for getting around this, either in the interface
> > design or programmatically?
> >
> > My app is written in objective C using Csound for iOS. Notes are currently
> > triggered through Steven Yi's keyboard from the Csound for iOS examples. I
> > use a turnoff instrument to end the notes when a keyup action happens. Here
> > is my csd:
> >
> > <CsoundSynthesizer>
> >
> > <CsOptions>
> >
> > </CsOptions>
> >
> > <CsInstruments>
> >
> >
> > sr = 44100
> >
> > ksmps = 128
> >
> > nchnls = 2
> >
> > 0dbfs = 1.0
> >
> >
> > giSine ftgen 3, 0, 16384, 10, 1
> >
> > giSquare ftgen 1, 0, 16384, 10, 1, 0 , .33, 0, .2 , 0, .14, 0 , .11, 0, .09
> > ;odd harmonics
> >
> > giSaw ftgen 2, 0, 16384, 10, 1, 0.5, 0.3, 0.25, 0.2, 0.167, 0.14, 0.125,
> > .111
> >
> >
> > maxalloc 2, 4
> >
> >
> > turnon 1000
> >
> > turnon 999
> >
> >
> > instr 1000 ;global controls
> >
> > ktune1 chnget "osc1tune"
> >
> > ktune2 chnget "osc2tune"
> >
> > koscmix chnget "oscbalance"
> >
> > kcutoff chnget "cutoff"
> >
> > kreson chnget "resonance"
> >
> > klfoamp chnget "lfoamp"
> >
> > klforate chnget "lforate"
> >
> > kfenvlev chnget "filterenvlevel"
> >
> >
> > gkactp port kactive, .01
> >
> > gktune1p port ktune1, .01
> >
> > gktune2p port ktune2, .01
> >
> > gkoscmix port koscmix, .01
> >
> > gkcutoff port kcutoff, .01
> >
> > gkreson port kreson, .01
> >
> > gklfoamp port klfoamp, .01
> >
> > gklforate port klforate, .01
> >
> > gkfenvlev port kfenvlev, .01
> >
> >
> > endin
> >
> >
> > instr 999
> >
> >
> > gklfo lfo gklfoamp, gklforate
> >
> >
> > endin
> >
> >
> > instr 1 ;turnoff instrument used in conjunction with keyUp
> >
> >
> > turnoff2 p4, 4, 1
> >
> > turnoff
> >
> >
> > endin
> >
> >
> > instr 2 ;subtractive synth
> >
> >
> > kcps init 0
> >
> > kkeytrak init 0
> >
> >
> > kactive active 2
> >
> > kactp port kactive, .01
> >
> >
> > kfiltenv mxadsr p7, p8, p9, p10
> >
> >
> > kcps1 = (440.0*exp(log(2.0)*((p4+gktune1p)-69.0)/12.0)) ;translates midi to
> > pitch
> >
> > kcps2 = (440.0*exp(log(2.0)*((p4+gktune2p)-69.0)/12.0))
> >
> > kkeytrack = (12*log2(gkcutoff/440)) ;sets up midi value for filter cutoff
> >
> > klocalcut =
> > (440.0*exp(log(2.0)*((p4+kkeytrack+gklfo+(kfiltenv*gkfenvlev))-69.0)/12.0))
> > ;uses midi value with input note to create keyboard tracking
> >
> >
> > apopenv mxadsr .03, 0, 1, .03
> >
> >
> >
> > aosc1 oscil3 1/(gkactp+1)*apopenv*(1-gkoscmix), kcps1, p5
> >
> > aosc2 oscil3 1/(gkactp+1)*apopenv*gkoscmix, kcps2, p6
> >
> >
> > afilter moogladder aosc1+aosc2, klocalcut, gkreson
> >
> >
> > ;aosc vco .25-(.1*kactive), kcps, 2, .5, giSine
> >
> >
> > outs afilter, afilter
> >
> > endin
> >
> >
> > </CsInstruments>
> >
> > <CsScore>
> >
> >
> > </CsScore>
> >
> > </CsoundSynthesizer>
> >
> >
> >
> > Csound mailing list Csound@listserv.heanet.ie
> > https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> > https://github.com/csound/csound/issues Discussions of bugs and features can
> > be posted here
>
>
>
> --
>
> Oeyvind Brandtsegg
> Professor of Music Technology
> NTNU
> 7491 Trondheim
> Norway
> Cell: +47 92 203 205
>
> http://www.partikkelaudio.com/
> http://soundcloud.com/brandtsegg
> http://flyndresang.no/
> http://soundcloud.com/t-emp
>
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