hello everybody!

i try to find a quick solution for rendering a multichannel file, from a instrument that produces a mono signal, but is called in a loop an gets an index from the channel count.

here is a dummy code

instr ctrl_instr
	iCnt init 0
	while (iCnt < 21) do
		event_i(„i“, „signal“, 0, 1, iChannel)
		iCnt += 1
		iChannel += 1
	od			
endin

instr signal
	aSig poscil 0.5, 440
	outch p4, aSig
endin

is there an elegant and quick solution for this?

greetings,
philipp

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your solution looks pretty good to me.
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 8 Jul 2025, at 16:05, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:
> 
> hello everybody!
> 
> i try to find a quick solution for rendering a multichannel file, from a instrument that produces a mono signal, but is called in a loop an gets an index from the channel count.
> 
> here is a dummy code
> 
> instr ctrl_instr
>    iCnt init 0
>    while (iCnt < 21) do
>        event_i(„i“, „signal“, 0, 1, iChannel)
>        iCnt += 1
>        iChannel += 1
>    od            
> endin
> 
> instr signal
>    aSig poscil 0.5, 440
>    outch p4, aSig
> endin
> 
> is there an elegant and quick solution for this?
> 
> greetings,
> philipp
> 
> 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

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Hi Philipp,
you can use outch, which takes a  channel parameter:
outch kchannel_number, aSignal ...
It can take further pairs of channel and signal.

Depending on what you REALLY want to do, there are other ways. If you want to 
create an instrument that potentially oututs its audio to all channels that 
the performance has, never mind how many or... You might take a look at the 
out* opcodes or perhaps create an intermediate instrument that takes audio 
from a channel (chn opcodes) and then performs magic with that, leaving the 
source instrument(s) more or less untouched or in a simple form.

Best wishes,

Jeanette

-- 
  * Website: http://juliencoder.de - for summer is a state of sound
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
  * Audiobombs: https://www.audiobombs.com/users/jeanette_c
  * GitHub: https://github.com/jeanette-c

'Cause I don't have to feel the heat of the sun
To know it's shining on me every day <3
(Britney Spears)

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ok, thats weird. i reduced my code to a minimal example and it stillt not works like i suggested. i run csound in emacs and it runs forever when i try to render this.
is there something wrong?



-d -odac -3 -W



sr = 48000
ksmps = 16
nchnls = 21
0dbfs = 1.0

schedule("ctrl", 0.1, 1)
instr ctrl
  iCnt init 0
  iChn init 0
  while (iCnt < nchnls) do
	event_i("i", "sig", 0, 5, iChn+1)
	iChn += 1
	iCnt += 1
  od
  turnoff
endin

instr sig
  iOutChn = p4
  aSig poscil 0.5, random:i(80, 800)
  outch iOutChn, aSig
endin









> Am 08.07.2025 um 17:41 schrieb vlz :
> 
> your solution looks pretty good to me.
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
> 
>> On 8 Jul 2025, at 16:05, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:
>> 
>> hello everybody!
>> 
>> i try to find a quick solution for rendering a multichannel file, from a instrument that produces a mono signal, but is called in a loop an gets an index from the channel count.
>> 
>> here is a dummy code
>> 
>> instr ctrl_instr
>>   iCnt init 0
>>   while (iCnt < 21) do
>>       event_i(„i“, „signal“, 0, 1, iChannel)
>>       iCnt += 1
>>       iChannel += 1
>>   od            
>> endin
>> 
>> instr signal
>>   aSig poscil 0.5, 440
>>   outch p4, aSig
>> endin
>> 
>> is there an elegant and quick solution for this?
>> 
>> greetings,
>> philipp
>> 
>> 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
> 
> 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
> 

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It will run forever because there is no score or end event. You can add "f 0 time" to close
Csound at a given time. Or send in an "e" event, with 0, time as pfields.

Prof. Victor Lazzarini
Maynooth University
Ireland

> On 8 Jul 2025, at 16:54, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:
> 
> ok, thats weird. i reduced my code to a minimal example and it stillt not works like i suggested. i run csound in emacs and it runs forever when i try to render this.
> is there something wrong?
> 
> 
> 
> -d -odac -3 -W
> 
> 
> 
> sr = 48000
> ksmps = 16
> nchnls = 21
> 0dbfs = 1.0
> 
> schedule("ctrl", 0.1, 1)
> instr ctrl
>  iCnt init 0
>  iChn init 0
>  while (iCnt < nchnls) do
>    event_i("i", "sig", 0, 5, iChn+1)
>    iChn += 1
>    iCnt += 1
>  od
>  turnoff
> endin
> 
> instr sig
>  iOutChn = p4
>  aSig poscil 0.5, random:i(80, 800)
>  outch iOutChn, aSig
> endin
> 
> 
> 
> 
> 
> 
> 
> 
> 
>> Am 08.07.2025 um 17:41 schrieb vlz :
>> 
>> your solution looks pretty good to me.
>> Prof. Victor Lazzarini
>> Maynooth University
>> Ireland
>> 
>>>> On 8 Jul 2025, at 16:05, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:
>>> 
>>> hello everybody!
>>> 
>>> i try to find a quick solution for rendering a multichannel file, from a instrument that produces a mono signal, but is called in a loop an gets an index from the channel count.
>>> 
>>> here is a dummy code
>>> 
>>> instr ctrl_instr
>>>  iCnt init 0
>>>  while (iCnt < 21) do
>>>      event_i(„i“, „signal“, 0, 1, iChannel)
>>>      iCnt += 1
>>>      iChannel += 1
>>>  od            
>>> endin
>>> 
>>> instr signal
>>>  aSig poscil 0.5, 440
>>>  outch p4, aSig
>>> endin
>>> 
>>> is there an elegant and quick solution for this?
>>> 
>>> greetings,
>>> philipp
>>> 
>>> 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
>> 
>> 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
>> 
> 
> 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

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Hi!

As your score is empty, it is correct that ir runs forever. You can add f 0 to the score to keep it running for a certain time. Like

f 0 5 ; keep running for 5 seconds

or

i "ctrl" 0 5 ; Csound exits when the score events will be ended.

If you want to render the output to a file, you should add an -o FILE option, something like:

-o name.wav

not -odac

But maybe you are using some other sort of solution or pipe the audio to some other program or so.

As always, there are som many ways to achieve one thing. (like monitor and fout opcodes bu your solution should work, too).

Best!

tarmo

Kontakt Philipp Neumann (<0000119f78f3a4f9-dmarc-request@listserv.heanet.ie>) kirjutas kuupäeval T, 8. juuli 2025 kell 18:54:

ok, thats weird. i reduced my code to a minimal example and it stillt not works like i suggested. i run csound in emacs and it runs forever when i try to render this.
is there something wrong?

<CsoundSynthesizer>
<CsOptions>
-d -odac -3 -W
</CsOptions>
<CsInstruments>

sr = 48000
ksmps = 16
nchnls = 21
0dbfs = 1.0

schedule("ctrl", 0.1, 1)
instr ctrl
  iCnt init 0
  iChn init 0
  while (iCnt < nchnls) do
        event_i("i", "sig", 0, 5, iChn+1)
        iChn += 1
        iCnt += 1
  od
  turnoff
endin

instr sig
  iOutChn = p4
  aSig poscil 0.5, random:i(80, 800)
  outch iOutChn, aSig
endin



</CsInstruments>
<CsScore>
</CsScore>
</CsoundSynthesizer>


> Am 08.07.2025 um 17:41 schrieb vlz <viclazzarini@GMAIL.COM>:
>
> your solution looks pretty good to me.
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
>
>> On 8 Jul 2025, at 16:05, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:
>>
>> hello everybody!
>>
>> i try to find a quick solution for rendering a multichannel file, from a instrument that produces a mono signal, but is called in a loop an gets an index from the channel count.
>>
>> here is a dummy code
>>
>> instr ctrl_instr
>>   iCnt init 0
>>   while (iCnt < 21) do
>>       event_i(„i“, „signal“, 0, 1, iChannel)
>>       iCnt += 1
>>       iChannel += 1
>>   od           
>> endin
>>
>> instr signal
>>   aSig poscil 0.5, 440
>>   outch p4, aSig
>> endin
>>
>> is there an elegant and quick solution for this?
>>
>> greetings,
>> philipp
>>
>> 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
>
> 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
>

Csound mailing list
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Send bugs reports to
        https://github.com/csound/csound/issues
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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

Thanks all!

The problem was, Csound was running forever, because of a missing end of score statement!

Greetings,
Philipp



> Am 09.07.2025 um 08:25 schrieb luis antunes pena <00000fd5d0d20dbf-dmarc-request@LISTSERV.HEANET.IE>:
> 
> Hi Philipp,
> maybe you are looking for the fout opcode, as Tarmo mentioned?
> Best,
> Luís
> 
> 
> On 08.07.25 18:58, Tarmo Johannes wrote:
>> Hi!
>> 
>> As your score is empty, it is correct that ir runs forever. You can add f 0 to the score to keep it running for a certain time. Like
>> 
>> f 0 5 ; keep running for 5 seconds
>> 
>> or 
>> 
>> i "ctrl" 0 5 ; Csound exits when the score events will be ended.
>> 
>> If you want to render the output to a file, you should add an -o FILE option, something like:
>> -o name.wav
>> not -odac
>> 
>> But maybe you are using some other sort of solution or pipe the audio to some other program or so.
>> As always, there are som many ways to achieve one thing. (like monitor and fout opcodes bu your solution should work, too).
>> 
>> Best!
>> tarmo
>> 
>> 
>> 
>> Kontakt Philipp Neumann (<0000119f78f3a4f9-dmarc-request@listserv.heanet.ie>) kirjutas kuupäeval T, 8. juuli 2025 kell 18:54:
>> ok, thats weird. i reduced my code to a minimal example and it stillt not works like i suggested. i run csound in emacs and it runs forever when i try to render this.
>> is there something wrong?
>> 
>> 
>> 
>> -d -odac -3 -W
>> 
>> 
>> 
>> sr = 48000
>> ksmps = 16
>> nchnls = 21
>> 0dbfs = 1.0
>> 
>> schedule("ctrl", 0.1, 1)
>> instr ctrl
>>   iCnt init 0
>>   iChn init 0
>>   while (iCnt < nchnls) do
>>         event_i("i", "sig", 0, 5, iChn+1)
>>         iChn += 1
>>         iCnt += 1
>>   od
>>   turnoff
>> endin
>> 
>> instr sig
>>   iOutChn = p4
>>   aSig poscil 0.5, random:i(80, 800)
>>   outch iOutChn, aSig
>> endin
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> > Am 08.07.2025 um 17:41 schrieb vlz :
>> > 
>> > your solution looks pretty good to me.
>> > Prof. Victor Lazzarini
>> > Maynooth University
>> > Ireland
>> > 
>> >> On 8 Jul 2025, at 16:05, Philipp Neumann <0000119f78f3a4f9-dmarc-request@listserv.heanet.ie> wrote:
>> >> 
>> >> hello everybody!
>> >> 
>> >> i try to find a quick solution for rendering a multichannel file, from a instrument that produces a mono signal, but is called in a loop an gets an index from the channel count.
>> >> 
>> >> here is a dummy code
>> >> 
>> >> instr ctrl_instr
>> >>   iCnt init 0
>> >>   while (iCnt < 21) do
>> >>       event_i(„i“, „signal“, 0, 1, iChannel)
>> >>       iCnt += 1
>> >>       iChannel += 1
>> >>   od            
>> >> endin
>> >> 
>> >> instr signal
>> >>   aSig poscil 0.5, 440
>> >>   outch p4, aSig
>> >> endin
>> >> 
>> >> is there an elegant and quick solution for this?
>> >> 
>> >> greetings,
>> >> philipp
>> >> 
>> >> 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
>> > 
>> > 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
>> > 
>> 
>> 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
>> 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
> 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

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