Hi, 

I'm using CSound iOS 5.19.02.2, and the MidiTest in the iOS examples. 
The example MidiTest works fine. 
However, when I try to run more intensive csd algorithms the sound drops out
when I play a few notes. It stutters and sometimes there is no sound at all.
It works a bit better when I drop the voice stealing instruments number of
voices to 8 or so. However, after this I tried an algorithm with more
opcodes like moogladder for processing that builds on the below code and the
sound broke up after a few notes pressed. 

All csds run fine in CSoundQt on Mac OSX btw. 

Is there something I've done wrong here, or is this an inherent limitation
of CSound on iOS?   

Thank you very much. 

My csd file. 



-o dac -+rtmidi=null -+rtaudio=null -d -+msg_color=0 -M0 -m0


nchnls=2
0dbfs=1
ksmps=64
sr = 44100

turnon 3
massign 0, 1

ga1 init 0


opcode	cpsmid, k, k

kmid	xin

#define MIDI2CPS(xmidi) # (440.0*exp(log(2.0)*(($xmidi)-69.0)/12.0)) #
kcps	=	$MIDI2CPS(kmid)

	xout	kcps

		endop


instr 1

midinoteonkey p4, p5

kvel = (p5/127.0) * 0.09 
kpch cpsmid (p4-19)
kpb init 0

iwhammy chnget "whammy"

if (iwhammy==1) then
    midipitchbend kpb ; whammy
else
    midipitchbend kpb, 0, 21.167 ;2 semi-tones
endif

kpch = octcps(kpch)
kcps = cpsoct(kpch + kpb)

iattack chnget "attack" 
idecay chnget "decay" 
isustain chnget "sustain" 
irelease chnget "release" 


;print iattack
;print idecay
;print isustain
;print irelease

k2 linsegr 0, iattack, 1, idecay, isustain, irelease, 0
a1 fmb3 k2*kvel, kcps, 5, 5, 0.1, 1, 1, 1, 1, 1, 1

ga1 = ga1 + a1

endin

instr 2

aL, aR reverbsc ga1, ga1, .72, 5000

aL clip aL, 0, 1
aR clip aR, 0, 1

outs aL, aR

ga1 = 0

endin

instr allNotesOff
turnoff2 1, 0, 1
turnoff
endin

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Voice "Stealing" Instrument
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
instr 3
kinstr init 1
kactive active kinstr
if kactive > 16 then
turnoff2 kinstr, 1, 0
endif
endin




f 1 0 32768 10 1

i2 0 360000






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Or is there any way I can optimize my csd such that it can run better in iOS? 



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moogladder is very heavy processing, you can try using moogvcf instead.

What you describe sounds like the processor is not being able to keep up with
the computation, so you will need to scale it down. You can also try dropping
the SR tp 32K or 22.05K.

Victor

On 15 Jun 2013, at 03:06, lppier wrote:

> Hi, 
> 
> I'm using CSound iOS 5.19.02.2, and the MidiTest in the iOS examples. 
> The example MidiTest works fine. 
> However, when I try to run more intensive csd algorithms the sound drops out
> when I play a few notes. It stutters and sometimes there is no sound at all.
> It works a bit better when I drop the voice stealing instruments number of
> voices to 8 or so. However, after this I tried an algorithm with more
> opcodes like moogladder for processing that builds on the below code and the
> sound broke up after a few notes pressed. 
> 
> All csds run fine in CSoundQt on Mac OSX btw. 
> 
> Is there something I've done wrong here, or is this an inherent limitation
> of CSound on iOS?   
> 
> Thank you very much. 
> 
> My csd file. 
> 
> 
> 
> -o dac -+rtmidi=null -+rtaudio=null -d -+msg_color=0 -M0 -m0
> 
> 
> nchnls=2
> 0dbfs=1
> ksmps=64
> sr = 44100
> 
> turnon 3
> massign 0, 1
> 
> ga1 init 0
> 
> 
> opcode	cpsmid, k, k
> 
> kmid	xin
> 
> #define MIDI2CPS(xmidi) # (440.0*exp(log(2.0)*(($xmidi)-69.0)/12.0)) #
> kcps	=	$MIDI2CPS(kmid)
> 
> 	xout	kcps
> 
> 		endop
> 
> 
> instr 1
> 
> midinoteonkey p4, p5
> 
> kvel = (p5/127.0) * 0.09 
> kpch cpsmid (p4-19)
> kpb init 0
> 
> iwhammy chnget "whammy"
> 
> if (iwhammy==1) then
>    midipitchbend kpb ; whammy
> else
>    midipitchbend kpb, 0, 21.167 ;2 semi-tones
> endif
> 
> kpch = octcps(kpch)
> kcps = cpsoct(kpch + kpb)
> 
> iattack chnget "attack" 
> idecay chnget "decay" 
> isustain chnget "sustain" 
> irelease chnget "release" 
> 
> 
> ;print iattack
> ;print idecay
> ;print isustain
> ;print irelease
> 
> k2 linsegr 0, iattack, 1, idecay, isustain, irelease, 0
> a1 fmb3 k2*kvel, kcps, 5, 5, 0.1, 1, 1, 1, 1, 1, 1
> 
> ga1 = ga1 + a1
> 
> endin
> 
> instr 2
> 
> aL, aR reverbsc ga1, ga1, .72, 5000
> 
> aL clip aL, 0, 1
> aR clip aR, 0, 1
> 
> outs aL, aR
> 
> ga1 = 0
> 
> endin
> 
> instr allNotesOff
> turnoff2 1, 0, 1
> turnoff
> endin
> 
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ;; Voice "Stealing" Instrument
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> instr 3
> kinstr init 1
> kactive active kinstr
> if kactive > 16 then
> turnoff2 kinstr, 1, 0
> endif
> endin
> 
> 
> 
> 
> f 1 0 32768 10 1
> 
> i2 0 360000
> 
> 
> 
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Stuttering-with-CSound-iOS-tp5724530.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
> ------------------------------------------------------------------------------
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> 
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> https://lists.sourceforge.net/lists/listinfo/csound-devel

Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie




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I'm thinking it could be the fmb3 as my code below does not use moogladder. Is it computationally intensive?

Pier.

On 15 Jun, 2013, at 4:01 PM, Victor Lazzarini  wrote:

> moogladder is very heavy processing, you can try using moogvcf instead.
> 
> What you describe sounds like the processor is not being able to keep up with
> the computation, so you will need to scale it down. You can also try dropping
> the SR tp 32K or 22.05K.
> 
> Victor
> 
> On 15 Jun 2013, at 03:06, lppier wrote:
> 
>> Hi, 
>> 
>> I'm using CSound iOS 5.19.02.2, and the MidiTest in the iOS examples. 
>> The example MidiTest works fine. 
>> However, when I try to run more intensive csd algorithms the sound drops out
>> when I play a few notes. It stutters and sometimes there is no sound at all.
>> It works a bit better when I drop the voice stealing instruments number of
>> voices to 8 or so. However, after this I tried an algorithm with more
>> opcodes like moogladder for processing that builds on the below code and the
>> sound broke up after a few notes pressed. 
>> 
>> All csds run fine in CSoundQt on Mac OSX btw. 
>> 
>> Is there something I've done wrong here, or is this an inherent limitation
>> of CSound on iOS?   
>> 
>> Thank you very much. 
>> 
>> My csd file. 
>> 
>> 
>> 
>> -o dac -+rtmidi=null -+rtaudio=null -d -+msg_color=0 -M0 -m0
>> 
>> 
>> nchnls=2
>> 0dbfs=1
>> ksmps=64
>> sr = 44100
>> 
>> turnon 3
>> massign 0, 1
>> 
>> ga1 init 0
>> 
>> 
>> opcode    cpsmid, k, k
>> 
>> kmid    xin
>> 
>> #define MIDI2CPS(xmidi) # (440.0*exp(log(2.0)*(($xmidi)-69.0)/12.0)) #
>> kcps    =    $MIDI2CPS(kmid)
>> 
>>    xout    kcps
>> 
>>        endop
>> 
>> 
>> instr 1
>> 
>> midinoteonkey p4, p5
>> 
>> kvel = (p5/127.0) * 0.09 
>> kpch cpsmid (p4-19)
>> kpb init 0
>> 
>> iwhammy chnget "whammy"
>> 
>> if (iwhammy==1) then
>>   midipitchbend kpb ; whammy
>> else
>>   midipitchbend kpb, 0, 21.167 ;2 semi-tones
>> endif
>> 
>> kpch = octcps(kpch)
>> kcps = cpsoct(kpch + kpb)
>> 
>> iattack chnget "attack" 
>> idecay chnget "decay" 
>> isustain chnget "sustain" 
>> irelease chnget "release" 
>> 
>> 
>> ;print iattack
>> ;print idecay
>> ;print isustain
>> ;print irelease
>> 
>> k2 linsegr 0, iattack, 1, idecay, isustain, irelease, 0
>> a1 fmb3 k2*kvel, kcps, 5, 5, 0.1, 1, 1, 1, 1, 1, 1
>> 
>> ga1 = ga1 + a1
>> 
>> endin
>> 
>> instr 2
>> 
>> aL, aR reverbsc ga1, ga1, .72, 5000
>> 
>> aL clip aL, 0, 1
>> aR clip aR, 0, 1
>> 
>> outs aL, aR
>> 
>> ga1 = 0
>> 
>> endin
>> 
>> instr allNotesOff
>> turnoff2 1, 0, 1
>> turnoff
>> endin
>> 
>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>> ;; Voice "Stealing" Instrument
>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>> instr 3
>> kinstr init 1
>> kactive active kinstr
>> if kactive > 16 then
>> turnoff2 kinstr, 1, 0
>> endif
>> endin
>> 
>> 
>> 
>> 
>> f 1 0 32768 10 1
>> 
>> i2 0 360000
>> 
>> 
>> 
>> 
>> 
>> 
>> --
>> View this message in context: http://csound.1045644.n5.nabble.com/Stuttering-with-CSound-iOS-tp5724530.html
>> Sent from the Csound - Dev mailing list archive at Nabble.com.
>> 
>> ------------------------------------------------------------------------------
>> This SF.net email is sponsored by Windows:
>> 
>> Build for Windows Store.
>> 
>> http://p.sf.net/sfu/windows-dev2dev
>> _______________________________________________
>> Csound-devel mailing list
>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
> 
> Dr Victor Lazzarini
> Senior Lecturer
> Dept. of Music
> NUI Maynooth Ireland
> tel.: +353 1 708 3545
> Victor dot Lazzarini AT nuim dot ie
> 
> 
> 
> 
> ------------------------------------------------------------------------------
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I actually don't know, I've never used it. Try replacing it by an oscillator just to isolate the issue.

Victor
On 15 Jun 2013, at 09:08, Pier wrote:

> I'm thinking it could be the fmb3 as my code below does not use moogladder. Is it computationally intensive?
> 
> Pier.
> 
> On 15 Jun, 2013, at 4:01 PM, Victor Lazzarini  wrote:
> 
>> moogladder is very heavy processing, you can try using moogvcf instead.
>> 
>> What you describe sounds like the processor is not being able to keep up with
>> the computation, so you will need to scale it down. You can also try dropping
>> the SR tp 32K or 22.05K.
>> 
>> Victor
>> 
>> On 15 Jun 2013, at 03:06, lppier wrote:
>> 
>>> Hi, 
>>> 
>>> I'm using CSound iOS 5.19.02.2, and the MidiTest in the iOS examples. 
>>> The example MidiTest works fine. 
>>> However, when I try to run more intensive csd algorithms the sound drops out
>>> when I play a few notes. It stutters and sometimes there is no sound at all.
>>> It works a bit better when I drop the voice stealing instruments number of
>>> voices to 8 or so. However, after this I tried an algorithm with more
>>> opcodes like moogladder for processing that builds on the below code and the
>>> sound broke up after a few notes pressed. 
>>> 
>>> All csds run fine in CSoundQt on Mac OSX btw. 
>>> 
>>> Is there something I've done wrong here, or is this an inherent limitation
>>> of CSound on iOS?   
>>> 
>>> Thank you very much. 
>>> 
>>> My csd file. 
>>> 
>>> 
>>> 
>>> -o dac -+rtmidi=null -+rtaudio=null -d -+msg_color=0 -M0 -m0
>>> 
>>> 
>>> nchnls=2
>>> 0dbfs=1
>>> ksmps=64
>>> sr = 44100
>>> 
>>> turnon 3
>>> massign 0, 1
>>> 
>>> ga1 init 0
>>> 
>>> 
>>> opcode    cpsmid, k, k
>>> 
>>> kmid    xin
>>> 
>>> #define MIDI2CPS(xmidi) # (440.0*exp(log(2.0)*(($xmidi)-69.0)/12.0)) #
>>> kcps    =    $MIDI2CPS(kmid)
>>> 
>>>   xout    kcps
>>> 
>>>       endop
>>> 
>>> 
>>> instr 1
>>> 
>>> midinoteonkey p4, p5
>>> 
>>> kvel = (p5/127.0) * 0.09 
>>> kpch cpsmid (p4-19)
>>> kpb init 0
>>> 
>>> iwhammy chnget "whammy"
>>> 
>>> if (iwhammy==1) then
>>>  midipitchbend kpb ; whammy
>>> else
>>>  midipitchbend kpb, 0, 21.167 ;2 semi-tones
>>> endif
>>> 
>>> kpch = octcps(kpch)
>>> kcps = cpsoct(kpch + kpb)
>>> 
>>> iattack chnget "attack" 
>>> idecay chnget "decay" 
>>> isustain chnget "sustain" 
>>> irelease chnget "release" 
>>> 
>>> 
>>> ;print iattack
>>> ;print idecay
>>> ;print isustain
>>> ;print irelease
>>> 
>>> k2 linsegr 0, iattack, 1, idecay, isustain, irelease, 0
>>> a1 fmb3 k2*kvel, kcps, 5, 5, 0.1, 1, 1, 1, 1, 1, 1
>>> 
>>> ga1 = ga1 + a1
>>> 
>>> endin
>>> 
>>> instr 2
>>> 
>>> aL, aR reverbsc ga1, ga1, .72, 5000
>>> 
>>> aL clip aL, 0, 1
>>> aR clip aR, 0, 1
>>> 
>>> outs aL, aR
>>> 
>>> ga1 = 0
>>> 
>>> endin
>>> 
>>> instr allNotesOff
>>> turnoff2 1, 0, 1
>>> turnoff
>>> endin
>>> 
>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>> ;; Voice "Stealing" Instrument
>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>> instr 3
>>> kinstr init 1
>>> kactive active kinstr
>>> if kactive > 16 then
>>> turnoff2 kinstr, 1, 0
>>> endif
>>> endin
>>> 
>>> 
>>> 
>>> 
>>> f 1 0 32768 10 1
>>> 
>>> i2 0 360000
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> --
>>> View this message in context: http://csound.1045644.n5.nabble.com/Stuttering-with-CSound-iOS-tp5724530.html
>>> Sent from the Csound - Dev mailing list archive at Nabble.com.
>>> 
>>> ------------------------------------------------------------------------------
>>> This SF.net email is sponsored by Windows:
>>> 
>>> Build for Windows Store.
>>> 
>>> http://p.sf.net/sfu/windows-dev2dev
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>>> Csound-devel mailing list
>>> Csound-devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>> 
>> Dr Victor Lazzarini
>> Senior Lecturer
>> Dept. of Music
>> NUI Maynooth Ireland
>> tel.: +353 1 708 3545
>> Victor dot Lazzarini AT nuim dot ie
>> 
>> 
>> 
>> 
>> ------------------------------------------------------------------------------
>> This SF.net email is sponsored by Windows:
>> 
>> Build for Windows Store.
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> 
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Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie




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Or the reverb. Try replacing it by a freeverb.
On 15 Jun 2013, at 09:08, Pier wrote:

> I'm thinking it could be the fmb3 as my code below does not use moogladder. Is it computationally intensive?
> 
> Pier.
> 
> On 15 Jun, 2013, at 4:01 PM, Victor Lazzarini  wrote:
> 
>> moogladder is very heavy processing, you can try using moogvcf instead.
>> 
>> What you describe sounds like the processor is not being able to keep up with
>> the computation, so you will need to scale it down. You can also try dropping
>> the SR tp 32K or 22.05K.
>> 
>> Victor
>> 
>> On 15 Jun 2013, at 03:06, lppier wrote:
>> 
>>> Hi, 
>>> 
>>> I'm using CSound iOS 5.19.02.2, and the MidiTest in the iOS examples. 
>>> The example MidiTest works fine. 
>>> However, when I try to run more intensive csd algorithms the sound drops out
>>> when I play a few notes. It stutters and sometimes there is no sound at all.
>>> It works a bit better when I drop the voice stealing instruments number of
>>> voices to 8 or so. However, after this I tried an algorithm with more
>>> opcodes like moogladder for processing that builds on the below code and the
>>> sound broke up after a few notes pressed. 
>>> 
>>> All csds run fine in CSoundQt on Mac OSX btw. 
>>> 
>>> Is there something I've done wrong here, or is this an inherent limitation
>>> of CSound on iOS?   
>>> 
>>> Thank you very much. 
>>> 
>>> My csd file. 
>>> 
>>> 
>>> 
>>> -o dac -+rtmidi=null -+rtaudio=null -d -+msg_color=0 -M0 -m0
>>> 
>>> 
>>> nchnls=2
>>> 0dbfs=1
>>> ksmps=64
>>> sr = 44100
>>> 
>>> turnon 3
>>> massign 0, 1
>>> 
>>> ga1 init 0
>>> 
>>> 
>>> opcode    cpsmid, k, k
>>> 
>>> kmid    xin
>>> 
>>> #define MIDI2CPS(xmidi) # (440.0*exp(log(2.0)*(($xmidi)-69.0)/12.0)) #
>>> kcps    =    $MIDI2CPS(kmid)
>>> 
>>>   xout    kcps
>>> 
>>>       endop
>>> 
>>> 
>>> instr 1
>>> 
>>> midinoteonkey p4, p5
>>> 
>>> kvel = (p5/127.0) * 0.09 
>>> kpch cpsmid (p4-19)
>>> kpb init 0
>>> 
>>> iwhammy chnget "whammy"
>>> 
>>> if (iwhammy==1) then
>>>  midipitchbend kpb ; whammy
>>> else
>>>  midipitchbend kpb, 0, 21.167 ;2 semi-tones
>>> endif
>>> 
>>> kpch = octcps(kpch)
>>> kcps = cpsoct(kpch + kpb)
>>> 
>>> iattack chnget "attack" 
>>> idecay chnget "decay" 
>>> isustain chnget "sustain" 
>>> irelease chnget "release" 
>>> 
>>> 
>>> ;print iattack
>>> ;print idecay
>>> ;print isustain
>>> ;print irelease
>>> 
>>> k2 linsegr 0, iattack, 1, idecay, isustain, irelease, 0
>>> a1 fmb3 k2*kvel, kcps, 5, 5, 0.1, 1, 1, 1, 1, 1, 1
>>> 
>>> ga1 = ga1 + a1
>>> 
>>> endin
>>> 
>>> instr 2
>>> 
>>> aL, aR reverbsc ga1, ga1, .72, 5000
>>> 
>>> aL clip aL, 0, 1
>>> aR clip aR, 0, 1
>>> 
>>> outs aL, aR
>>> 
>>> ga1 = 0
>>> 
>>> endin
>>> 
>>> instr allNotesOff
>>> turnoff2 1, 0, 1
>>> turnoff
>>> endin
>>> 
>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>> ;; Voice "Stealing" Instrument
>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>> instr 3
>>> kinstr init 1
>>> kactive active kinstr
>>> if kactive > 16 then
>>> turnoff2 kinstr, 1, 0
>>> endif
>>> endin
>>> 
>>> 
>>> 
>>> 
>>> f 1 0 32768 10 1
>>> 
>>> i2 0 360000
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> --
>>> View this message in context: http://csound.1045644.n5.nabble.com/Stuttering-with-CSound-iOS-tp5724530.html
>>> Sent from the Csound - Dev mailing list archive at Nabble.com.
>>> 
>>> ------------------------------------------------------------------------------
>>> This SF.net email is sponsored by Windows:
>>> 
>>> Build for Windows Store.
>>> 
>>> http://p.sf.net/sfu/windows-dev2dev
>>> _______________________________________________
>>> Csound-devel mailing list
>>> Csound-devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>> 
>> Dr Victor Lazzarini
>> Senior Lecturer
>> Dept. of Music
>> NUI Maynooth Ireland
>> tel.: +353 1 708 3545
>> Victor dot Lazzarini AT nuim dot ie
>> 
>> 
>> 
>> 
>> ------------------------------------------------------------------------------
>> This SF.net email is sponsored by Windows:
>> 
>> Build for Windows Store.
>> 
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> 
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Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie




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by the way why don't you you use the cpsmidinn opcode to do this?
On 15 Jun 2013, at 09:08, Pier wrote:

>>> #define MIDI2CPS(xmidi) # (440.0*exp(log(2.0)*(($xmidi)-69.0)/12.0)) #

Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie




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Thanks for the suggestions sir, I get the general idea to isolate the opcodes, will try to get some nice sounds!

Sent from my iPhone

> On 15 Jun, 2013, at 4:24 pm, Victor Lazzarini  wrote:
> 
> Or the reverb. Try replacing it by a freeverb.
>> On 15 Jun 2013, at 09:08, Pier wrote:
>> 
>> I'm thinking it could be the fmb3 as my code below does not use moogladder. Is it computationally intensive?
>> 
>> Pier.
>> 
>>> On 15 Jun, 2013, at 4:01 PM, Victor Lazzarini  wrote:
>>> 
>>> moogladder is very heavy processing, you can try using moogvcf instead.
>>> 
>>> What you describe sounds like the processor is not being able to keep up with
>>> the computation, so you will need to scale it down. You can also try dropping
>>> the SR tp 32K or 22.05K.
>>> 
>>> Victor
>>> 
>>>> On 15 Jun 2013, at 03:06, lppier wrote:
>>>> 
>>>> Hi, 
>>>> 
>>>> I'm using CSound iOS 5.19.02.2, and the MidiTest in the iOS examples. 
>>>> The example MidiTest works fine. 
>>>> However, when I try to run more intensive csd algorithms the sound drops out
>>>> when I play a few notes. It stutters and sometimes there is no sound at all.
>>>> It works a bit better when I drop the voice stealing instruments number of
>>>> voices to 8 or so. However, after this I tried an algorithm with more
>>>> opcodes like moogladder for processing that builds on the below code and the
>>>> sound broke up after a few notes pressed. 
>>>> 
>>>> All csds run fine in CSoundQt on Mac OSX btw. 
>>>> 
>>>> Is there something I've done wrong here, or is this an inherent limitation
>>>> of CSound on iOS?   
>>>> 
>>>> Thank you very much. 
>>>> 
>>>> My csd file. 
>>>> 
>>>> 
>>>> 
>>>> -o dac -+rtmidi=null -+rtaudio=null -d -+msg_color=0 -M0 -m0
>>>> 
>>>> 
>>>> nchnls=2
>>>> 0dbfs=1
>>>> ksmps=64
>>>> sr = 44100
>>>> 
>>>> turnon 3
>>>> massign 0, 1
>>>> 
>>>> ga1 init 0
>>>> 
>>>> 
>>>> opcode    cpsmid, k, k
>>>> 
>>>> kmid    xin
>>>> 
>>>> #define MIDI2CPS(xmidi) # (440.0*exp(log(2.0)*(($xmidi)-69.0)/12.0)) #
>>>> kcps    =    $MIDI2CPS(kmid)
>>>> 
>>>>  xout    kcps
>>>> 
>>>>      endop
>>>> 
>>>> 
>>>> instr 1
>>>> 
>>>> midinoteonkey p4, p5
>>>> 
>>>> kvel = (p5/127.0) * 0.09 
>>>> kpch cpsmid (p4-19)
>>>> kpb init 0
>>>> 
>>>> iwhammy chnget "whammy"
>>>> 
>>>> if (iwhammy==1) then
>>>> midipitchbend kpb ; whammy
>>>> else
>>>> midipitchbend kpb, 0, 21.167 ;2 semi-tones
>>>> endif
>>>> 
>>>> kpch = octcps(kpch)
>>>> kcps = cpsoct(kpch + kpb)
>>>> 
>>>> iattack chnget "attack" 
>>>> idecay chnget "decay" 
>>>> isustain chnget "sustain" 
>>>> irelease chnget "release" 
>>>> 
>>>> 
>>>> ;print iattack
>>>> ;print idecay
>>>> ;print isustain
>>>> ;print irelease
>>>> 
>>>> k2 linsegr 0, iattack, 1, idecay, isustain, irelease, 0
>>>> a1 fmb3 k2*kvel, kcps, 5, 5, 0.1, 1, 1, 1, 1, 1, 1
>>>> 
>>>> ga1 = ga1 + a1
>>>> 
>>>> endin
>>>> 
>>>> instr 2
>>>> 
>>>> aL, aR reverbsc ga1, ga1, .72, 5000
>>>> 
>>>> aL clip aL, 0, 1
>>>> aR clip aR, 0, 1
>>>> 
>>>> outs aL, aR
>>>> 
>>>> ga1 = 0
>>>> 
>>>> endin
>>>> 
>>>> instr allNotesOff
>>>> turnoff2 1, 0, 1
>>>> turnoff
>>>> endin
>>>> 
>>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>> ;; Voice "Stealing" Instrument
>>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>> instr 3
>>>> kinstr init 1
>>>> kactive active kinstr
>>>> if kactive > 16 then
>>>> turnoff2 kinstr, 1, 0
>>>> endif
>>>> endin
>>>> 
>>>> 
>>>> 
>>>> 
>>>> f 1 0 32768 10 1
>>>> 
>>>> i2 0 360000
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> --
>>>> View this message in context: http://csound.1045644.n5.nabble.com/Stuttering-with-CSound-iOS-tp5724530.html
>>>> Sent from the Csound - Dev mailing list archive at Nabble.com.
>>>> 
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>>> 
>>> Dr Victor Lazzarini
>>> Senior Lecturer
>>> Dept. of Music
>>> NUI Maynooth Ireland
>>> tel.: +353 1 708 3545
>>> Victor dot Lazzarini AT nuim dot ie
>>> 
>>> 
>>> 
>>> 
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>> 
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> 
> Dr Victor Lazzarini
> Senior Lecturer
> Dept. of Music
> NUI Maynooth Ireland
> tel.: +353 1 708 3545
> Victor dot Lazzarini AT nuim dot ie
> 
> 
> 
> 
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I sort of built up the code from the miditest example, didn't realise there was a cpsmidinn… :D