Hi,

Is it currently only possible to use OSC via the UDP server in Csound 7?

Thanks,
Adam

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 Hi Tarmo and Victor,

Thanks for your replies. 

Tarmo, trying to use the OSCinit opcode in Csound 7 results in “error: Unable to find opcode with name: OSCinit” so my understanding is that the UDP server is currently the only way to start an OSC server and create a port.

Victor, are there plans to eventually include all the old OSC opcodes in Csound 7, either directly or as part of the optional plugins repository?

I’ve been using the UDP server and really like how much extra OSC functionality it adds. 

The main reason for my question is that I find there is a subtle difference in the way Csound sounds with and without the UDP server. It’s a small enough difference that I sometimes think I’m just imagining it because it sounds good either way and I think this is mostly just a case of me overthinking things.

The UDP server is fantastic and adds a lot of very useful features to Csound so I’m certainly not complaining about its sound quality. However, particularly if I’m working with very short sounds, I subjectively prefer the way Csound sounds without the UDP server so I just wanted to confirm what the current options are for working with OSC.

Thanks,

Adam

On 2 Dec 2025, at 21:27, Tarmo Johannes <trmjhnns@gmail.com> wrote:

Hi Adam!

OSC over UDP server is great but the traditional OSClisten should work as well.

Or you had problems?

Tarmo

T, 2. detsember 2025 08:55 Victor Lazzarini <000010b17ddd988e-dmarc-request@listserv.heanet.ie> kirjutas:

yes, see

https://csound.com/manual/overview/udp-server/

Prof. Victor Lazzarini

Maynooth University

Ireland

On 2 Dec 2025, at 04:18, Adam Willetts <adam@ethermap.org> wrote:

*Warning*

This email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.

Hi,

Is it currently only possible to use OSC via the UDP server in Csound 7?

Thanks,
Adam

Csound mailing list
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Hi,

Thank you for including the OSC plugin opcodes in a recent beta release.

I’ve just tried the first overload of the plugin version of OSClisten and it doesn’t seem to work if Csound 7 variable syntax is used for the xdata/output variables. The input variables all work with Csound 7 syntax and everything works fine if the old variable syntax is used for the xdata/output variables. 

Thanks,

Adam

On 3 Dec 2025, at 19:42, Victor Lazzarini <000010b17ddd988e-dmarc-request@LISTSERV.HEANET.IE> wrote:

Hi Adam,

yes, the OSC plugin opcodes are not in the beta releases, but the plans are to include them as before. It just needs to be added to the CI script.

best

Prof. Victor Lazzarini

Maynooth University

Ireland

On 3 Dec 2025, at 00:53, Adam Willetts <adam@ethermap.org> wrote:

 Hi Tarmo and Victor,

Thanks for your replies. 

Tarmo, trying to use the OSCinit opcode in Csound 7 results in “error:  Unable to find opcode with name: OSCinit” so my understanding is that the UDP server is currently the only way to start an OSC server and create a port.

Victor, are there plans to eventually include all the old OSC opcodes in Csound 7, either directly or as part of the optional plugins repository?

I’ve been using the UDP server and really like how much extra OSC functionality it adds. 

The main reason for my question is that I find there is a subtle difference in the way Csound sounds with and without the UDP server. It’s a small enough difference that I sometimes think I’m just imagining it because it sounds good either way and I think this is mostly just a case of me overthinking things.

The UDP server is fantastic and adds a lot of very useful features to Csound so I’m certainly not complaining about its sound quality. However, particularly if I’m working with very short sounds, I subjectively prefer the way Csound sounds without the UDP server so I just wanted to confirm what the current options are for working with OSC.

Thanks,

Adam

On 2 Dec 2025, at 21:27, Tarmo Johannes <trmjhnns@gmail.com> wrote:

Hi Adam!

OSC over UDP server is great but the traditional OSClisten should work as well.

Or you had problems?

Tarmo

T, 2. detsember 2025 08:55 Victor Lazzarini <000010b17ddd988e-dmarc-request@listserv.heanet.ie> kirjutas:

yes, see

https://csound.com/manual/overview/udp-server/

Prof. Victor Lazzarini

Maynooth University

Ireland

On 2 Dec 2025, at 04:18, Adam Willetts <adam@ethermap.org> wrote:

*Warning*

This email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.

Hi,

Is it currently only possible to use OSC via the UDP server in Csound 7?

Thanks,
Adam

Csound mailing list
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Hi,

Yes, that’s one of several ways the UDP server OSClisten improves on the plugin versions and I agree about keeping the new version distinct. My first email wasn't very clear, sorry.

I was talking about the first overload of the plugin version of OSClisten that, unlike most other opcodes, places outputs on the right hand side of the operation like inputs. In the manual they are shown as [, xdata1, xdata2, …]. These variables only seem to work using the old variable syntax.

In the following example instr 1 works but instr 2 causes a segmentation fault with the error message: 

INIT ERROR in instr 2 (opcode OSClisten) line 24: argument list inconsistent with format string

oscport@global:i = OSCinit(10000)

instr 1

k1 init 0

status:k = OSClisten(oscport, "/controller", "f", k1)

endin

instr 2

one:k init 0

status:k = OSClisten(oscport, "/controller", "f", one)

endin

;schedule(1, 0, -1)

schedule(2, 0, -1)

Thanks,

Adam

On 12 Jan 2026, at 19:41, vlz <viclazzarini@GMAIL.COM> wrote:

The OSClisten with outputs is only used with the UDP server OSC (it doesn't take a handle), the OSC opcodes from libosc.dylib have not changed. The idea was to make the new version distinct. 

Prof. Victor Lazzarini

Maynooth University

Ireland

On 12 Jan 2026, at 03:09, Adam Willetts <adam@ethermap.org> wrote:

Hi,

Thank you for including the OSC plugin opcodes in a recent beta release.

I’ve just tried the first overload of the plugin version of OSClisten and it doesn’t seem to work if Csound 7 variable syntax is used for the xdata/output variables. The input variables all work with Csound 7 syntax and everything works fine if the old variable syntax is used for the xdata/output variables. 

Thanks,

Adam

On 3 Dec 2025, at 19:42, Victor Lazzarini <000010b17ddd988e-dmarc-request@LISTSERV.HEANET.IE> wrote:

Hi Adam,

yes, the OSC plugin opcodes are not in the beta releases, but the plans are to include them as before. It just needs to be added to the CI script.

best

Prof. Victor Lazzarini

Maynooth University

Ireland

On 3 Dec 2025, at 00:53, Adam Willetts <adam@ethermap.org> wrote:

 Hi Tarmo and Victor,

Thanks for your replies. 

Tarmo, trying to use the OSCinit opcode in Csound 7 results in “error:  Unable to find opcode with name: OSCinit” so my understanding is that the UDP server is currently the only way to start an OSC server and create a port.

Victor, are there plans to eventually include all the old OSC opcodes in Csound 7, either directly or as part of the optional plugins repository?

I’ve been using the UDP server and really like how much extra OSC functionality it adds. 

The main reason for my question is that I find there is a subtle difference in the way Csound sounds with and without the UDP server. It’s a small enough difference that I sometimes think I’m just imagining it because it sounds good either way and I think this is mostly just a case of me overthinking things.

The UDP server is fantastic and adds a lot of very useful features to Csound so I’m certainly not complaining about its sound quality. However, particularly if I’m working with very short sounds, I subjectively prefer the way Csound sounds without the UDP server so I just wanted to confirm what the current options are for working with OSC.

Thanks,

Adam

On 2 Dec 2025, at 21:27, Tarmo Johannes <trmjhnns@gmail.com> wrote:

Hi Adam!

OSC over UDP server is great but the traditional OSClisten should work as well.

Or you had problems?

Tarmo

T, 2. detsember 2025 08:55 Victor Lazzarini <000010b17ddd988e-dmarc-request@listserv.heanet.ie> kirjutas:

yes, see

https://csound.com/manual/overview/udp-server/

Prof. Victor Lazzarini

Maynooth University

Ireland

On 2 Dec 2025, at 04:18, Adam Willetts <adam@ethermap.org> wrote:

*Warning*

This email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.

Hi,

Is it currently only possible to use OSC via the UDP server in Csound 7?

Thanks,
Adam

Csound mailing list
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yes, the code had never been updated to use the type system to check the
argument types. It still relied on variable names for that (it must be something like 20-year old code that
was never touched). I’ve sent in a PR with a fix.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland






> On 14 Jan 2026, at 22:50, Adam Willetts  wrote:
>
> Hi,
>
> Yes, that’s one of several ways the UDP server OSClisten improves on the plugin versions and I agree about keeping the new version distinct. My first email wasn't very clear, sorry.
> I was talking about the first overload of the plugin version of OSClisten that, unlike most other opcodes, places outputs on the right hand side of the operation like inputs. In the manual they are shown as [, xdata1, xdata2, …]. These variables only seem to work using the old variable syntax.
>
> In the following example instr 1 works but instr 2 causes a segmentation fault with the error message:
> INIT ERROR in instr 2 (opcode OSClisten) line 24: argument list inconsistent with format string
>
> oscport@global:i = OSCinit(10000)
>
> instr 1
> k1 init 0
> status:k = OSClisten(oscport, "/controller", "f", k1)
> endin
>
> instr 2
> one:k init 0
> status:k = OSClisten(oscport, "/controller", "f", one)
> endin
>
> ;schedule(1, 0, -1)
> schedule(2, 0, -1)
>
> Thanks,
> Adam
>
>> On 12 Jan 2026, at 19:41, vlz  wrote:
>>
>> The OSClisten with outputs is only used with the UDP server OSC (it doesn't take a handle), the OSC opcodes from libosc.dylib have not changed. The idea was to make the new version distinct.
>>
>> Prof. Victor Lazzarini
>> Maynooth University
>> Ireland
>>
>>> On 12 Jan 2026, at 03:09, Adam Willetts  wrote:
>>>
>>> Hi,
>>>
>>> Thank you for including the OSC plugin opcodes in a recent beta release.
>>> I’ve just tried the first overload of the plugin version of OSClisten and it doesn’t seem to work if Csound 7 variable syntax is used for the xdata/output variables. The input variables all work with Csound 7 syntax and everything works fine if the old variable syntax is used for the xdata/output variables.
>>>
>>> Thanks,
>>> Adam
>>>
>>>
>>>> On 3 Dec 2025, at 19:42, Victor Lazzarini <000010b17ddd988e-dmarc-request@LISTSERV.HEANET.IE> wrote:
>>>>
>>>> Hi Adam,
>>>>
>>>> yes, the OSC plugin opcodes are not in the beta releases, but the plans are to include them as before. It just needs to be added to the CI script.
>>>>
>>>> best
>>>> Prof. Victor Lazzarini
>>>> Maynooth University
>>>> Ireland
>>>>
>>>>> On 3 Dec 2025, at 00:53, Adam Willetts  wrote:
>>>>>
>>>>>  Hi Tarmo and Victor,
>>>>>
>>>>> Thanks for your replies.
>>>>>
>>>>> Tarmo, trying to use the OSCinit opcode in Csound 7 results in “error:  Unable to find opcode with name: OSCinit” so my understanding is that the UDP server is currently the only way to start an OSC server and create a port.
>>>>>
>>>>> Victor, are there plans to eventually include all the old OSC opcodes in Csound 7, either directly or as part of the optional plugins repository?
>>>>>
>>>>> I’ve been using the UDP server and really like how much extra OSC functionality it adds.
>>>>>
>>>>> The main reason for my question is that I find there is a subtle difference in the way Csound sounds with and without the UDP server. It’s a small enough difference that I sometimes think I’m just imagining it because it sounds good either way and I think this is mostly just a case of me overthinking things.
>>>>> The UDP server is fantastic and adds a lot of very useful features to Csound so I’m certainly not complaining about its sound quality. However, particularly if I’m working with very short sounds, I subjectively prefer the way Csound sounds without the UDP server so I just wanted to confirm what the current options are for working with OSC.
>>>>>
>>>>> Thanks,
>>>>> Adam
>>>>>
>>>>>
>>>>>> On 2 Dec 2025, at 21:27, Tarmo Johannes  wrote:
>>>>>>
>>>>>> Hi Adam!
>>>>>>
>>>>>> OSC over UDP server is great but the traditional OSClisten should work as well.
>>>>>> Or you had problems?
>>>>>>
>>>>>> Tarmo
>>>>>>
>>>>>>
>>>>>> T, 2. detsember 2025 08:55 Victor Lazzarini <000010b17ddd988e-dmarc-request@listserv.heanet.ie> kirjutas:
>>>>>> yes, see
>>>>>>
>>>>>> https://csound.com/manual/overview/udp-server/
>>>>>>
>>>>>>
>>>>>> Prof. Victor Lazzarini
>>>>>> Maynooth University
>>>>>> Ireland
>>>>>>
>>>>>>> On 2 Dec 2025, at 04:18, Adam Willetts  wrote:
>>>>>>>
>>>>>>> *Warning*
>>>>>>>
>>>>>>> This email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> Is it currently only possible to use OSC via the UDP server in Csound 7?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Adam
>>>>>>>
>>>>>>> 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 tohttps://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 tohttps://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 tohttps://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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 Hi Victor,

Thanks for the quick fix. Everything is working as expected now.

Thanks,

Adam

On 15 Jan 2026, at 13:07, Victor Lazzarini <000010b17ddd988e-dmarc-request@LISTSERV.HEANET.IE> wrote:

yes, the code had never been updated to use the type system to check the
argument types. It still relied on variable names for that (it must be something like 20-year old code that
was never touched). I’ve sent in a PR with a fix.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

On 14 Jan 2026, at 22:50, Adam Willetts <adam@ETHERMAP.ORG> wrote:

Hi,

Yes, that’s one of several ways the UDP server OSClisten improves on the plugin versions and I agree about keeping the new version distinct. My first email wasn't very clear, sorry.
I was talking about the first overload of the plugin version of OSClisten that, unlike most other opcodes, places outputs on the right hand side of the operation like inputs. In the manual they are shown as [, xdata1, xdata2, …]. These variables only seem to work using the old variable syntax.

In the following example instr 1 works but instr 2 causes a segmentation fault with the error message:
INIT ERROR in instr 2 (opcode OSClisten) line 24: argument list inconsistent with format string

oscport@global:i = OSCinit(10000)

instr 1
k1 init 0
status:k = OSClisten(oscport, "/controller", "f", k1)
endin

instr 2
one:k init 0
status:k = OSClisten(oscport, "/controller", "f", one)
endin

;schedule(1, 0, -1)
schedule(2, 0, -1)

Thanks,
Adam

On 12 Jan 2026, at 19:41, vlz <viclazzarini@GMAIL.COM> wrote:

The OSClisten with outputs is only used with the UDP server OSC (it doesn't take a handle), the OSC opcodes from libosc.dylib have not changed. The idea was to make the new version distinct.

Prof. Victor Lazzarini
Maynooth University
Ireland

On 12 Jan 2026, at 03:09, Adam Willetts <adam@ethermap.org> wrote:

Hi,

Thank you for including the OSC plugin opcodes in a recent beta release.
I’ve just tried the first overload of the plugin version of OSClisten and it doesn’t seem to work if Csound 7 variable syntax is used for the xdata/output variables. The input variables all work with Csound 7 syntax and everything works fine if the old variable syntax is used for the xdata/output variables.

Thanks,
Adam

On 3 Dec 2025, at 19:42, Victor Lazzarini <000010b17ddd988e-dmarc-request@LISTSERV.HEANET.IE> wrote:

Hi Adam,

yes, the OSC plugin opcodes are not in the beta releases, but the plans are to include them as before. It just needs to be added to the CI script.

best
Prof. Victor Lazzarini
Maynooth University
Ireland

On 3 Dec 2025, at 00:53, Adam Willetts <adam@ethermap.org> wrote:

 Hi Tarmo and Victor,

Thanks for your replies.

Tarmo, trying to use the OSCinit opcode in Csound 7 results in “error:  Unable to find opcode with name: OSCinit” so my understanding is that the UDP server is currently the only way to start an OSC server and create a port.

Victor, are there plans to eventually include all the old OSC opcodes in Csound 7, either directly or as part of the optional plugins repository?

I’ve been using the UDP server and really like how much extra OSC functionality it adds.

The main reason for my question is that I find there is a subtle difference in the way Csound sounds with and without the UDP server. It’s a small enough difference that I sometimes think I’m just imagining it because it sounds good either way and I think this is mostly just a case of me overthinking things.
The UDP server is fantastic and adds a lot of very useful features to Csound so I’m certainly not complaining about its sound quality. However, particularly if I’m working with very short sounds, I subjectively prefer the way Csound sounds without the UDP server so I just wanted to confirm what the current options are for working with OSC.

Thanks,
Adam

On 2 Dec 2025, at 21:27, Tarmo Johannes <trmjhnns@gmail.com> wrote:

Hi Adam!

OSC over UDP server is great but the traditional OSClisten should work as well.
Or you had problems?

Tarmo


T, 2. detsember 2025 08:55 Victor Lazzarini <000010b17ddd988e-dmarc-request@listserv.heanet.ie> kirjutas:
yes, see

https://csound.com/manual/overview/udp-server/


Prof. Victor Lazzarini
Maynooth University
Ireland

On 2 Dec 2025, at 04:18, Adam Willetts <adam@ethermap.org> wrote:

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Hi,

Is it currently only possible to use OSC via the UDP server in Csound 7?

Thanks,
Adam

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