Yes, it would be nice to know clearly what opcodes do interpolation
and which do not. The manual for wgpluck states that it uses
interpolating delay lines, I had assumed this means fractional sample
delays for fine tuning ... but maybe not?

2015-10-26 16:30 GMT+01:00 Aaron Krister Johnson :
> Does anyone use wgpluck and wgpluck2? Has anyone noticed how horribly
> out-of-tune they are?
>
> Try playing octaves on a midi keyboard, for instance, with a simple
> midi-triggered instrument using wgpluck2 as its guts.
>
> I suspect that the issue is the non-usage of Lagrangian interpolation on the
> delay lines that make up the waveguide.
>
> The open source "pyo" Python library for DSP of Olivier Belanger is an
> example of where this is done right, and I'm wondering it would be an easy
> thing to use that code-base as an example incorporate interpolation into the
> delay lines of these opcodes to make them actually usuable for musical
> purposes :)
>
> Aaron Krister Johnson
> http://www.untwelve.org
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On Tue, 27 Oct 2015, Oeyvind Brandtsegg wrote:

> Yes, it would be nice to know clearly what opcodes do interpolation
> and which do not. The manual for wgpluck states that it uses
> interpolating delay lines, I had assumed this means fractional sample
> delays for fine tuning ... but maybe not?
>

Looking at the code....it kooks as if wgpluck only uses interpolation for 
the listening point.  It uses oversampling for delay lines less that 256 
samples, so the documentation is suspect.  I guess it needs a wgpluck3 
with better interpolatio.

==John ff

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That message was for wgpluck2 (and repluck)..  The code for wgpluck is 
harder for me to follow, but I think it does use an allpass filter to 
tune.

On Tue, 27 Oct 2015, jpff wrote:

> On Tue, 27 Oct 2015, Oeyvind Brandtsegg wrote:
>
>> Yes, it would be nice to know clearly what opcodes do interpolation
>> and which do not. The manual for wgpluck states that it uses
>> interpolating delay lines, I had assumed this means fractional sample
>> delays for fine tuning ... but maybe not?
>> 
>
> Looking at the code....it kooks as if wgpluck only uses interpolation for the 
> listening point.  It uses oversampling for delay lines less that 256 samples, 
> so the documentation is suspect.  I guess it needs a wgpluck3 with better 
> interpolatio.
>
> ==John ff
>
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Is it not possible to fix the interpolation without needing a third opcode?

Victor Lazzarini
Dean of Arts, Celtic Studies, and Philosophy
Maynooth University
Ireland

> On 27 Oct 2015, at 15:32, jpff  wrote:
> 
>> On Tue, 27 Oct 2015, Oeyvind Brandtsegg wrote:
>> 
>> Yes, it would be nice to know clearly what opcodes do interpolation
>> and which do not. The manual for wgpluck states that it uses
>> interpolating delay lines, I had assumed this means fractional sample
>> delays for fine tuning ... but maybe not?
> 
> Looking at the code....it kooks as if wgpluck only uses interpolation for the listening point.  It uses oversampling for delay lines less that 256 samples, so the documentation is suspect.  I guess it needs a wgpluck3 with better interpolatio.
> 
> ==John ff
> 
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We cannot change an opcode tat much -- someone may be using the bad 
tuning.  Aty least that was my thinking
==John ff

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Could we use an optional argument to enable the precise tuning?

2015-10-27 18:02 GMT+01:00 jpff :
> We cannot change an opcode tat much -- someone may be using the bad tuning.
> Aty least that was my thinking
>
> ==John ff
>
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I think there is the same problem with wgflute, wgbow and similar (cannot check right now). To me a whole set of new opcodes with  corrected tunings, as John suggested, would make sense.
Tarmo

wflute, wgbow . are the STK algorithms.  wgpluck, wgpluck2 and repluck are 
not


On Tue, 27 Oct 2015, Victor Lazzarini wrote:

> which makes me wonder whether the versions of these in the Stk opcode
> collection are in tune or not all. Maybe they
> are the alternative we're looking for?
> 
> Victor LazzariniDean of Arts, Celtic Studies, and Philosophy
> Maynooth University
> Ireland
> 
> On 27 Oct 2015, at 18:15, Tarmo Johannes 
> wrote:
>
>       I think there is the same problem with wgflute, wgbow and similar
>       (cannot check right now). To me a whole set of new opcodes with 
>       corrected tunings, as John suggested, would make sense.
>       Tarmo
>
>       27.10.2015 19:18 kirjutas kuupäeval "Oeyvind Brandtsegg"
>       :
>             Could we use an optional argument to enable the
>             precise tuning?
>
>             2015-10-27 18:02 GMT+01:00 jpff :
>             > We cannot change an opcode tat much -- someone may
>             be using the bad tuning.
>             > Aty least that was my thinking
>             >
>             > ==John ff
>             >
>             > Csound mailing list
>             > Csound@listserv.heanet.ie
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>             > 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://flyndresang.no/
>             http://www.partikkelaudio.com/
>             http://soundcloud.com/brandtsegg
>             http://soundcloud.com/t-emp
>
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Are these stk algorithms in tune?
========================
Dr Victor Lazzarini
Dean of Arts, Celtic Studies and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 28 Oct 2015, at 09:57, jpff  wrote:
> 
> wflute, wgbow . are the STK algorithms.  wgpluck, wgpluck2 and repluck are not
> 
> 
> On Tue, 27 Oct 2015, Victor Lazzarini wrote:
> 
>> which makes me wonder whether the versions of these in the Stk opcode
>> collection are in tune or not all. Maybe they
>> are the alternative we're looking for?
>> Victor LazzariniDean of Arts, Celtic Studies, and Philosophy
>> Maynooth University
>> Ireland
>> On 27 Oct 2015, at 18:15, Tarmo Johannes 
>> wrote:
>> 
>>      I think there is the same problem with wgflute, wgbow and similar
>>      (cannot check right now). To me a whole set of new opcodes with 
>>      corrected tunings, as John suggested, would make sense.
>>      Tarmo
>> 
>>      27.10.2015 19:18 kirjutas kuupäeval "Oeyvind Brandtsegg"
>>      :
>>            Could we use an optional argument to enable the
>>            precise tuning?
>> 
>>            2015-10-27 18:02 GMT+01:00 jpff :
>>            > We cannot change an opcode tat much -- someone may
>>            be using the bad tuning.
>>            > Aty least that was my thinking
>>            >
>>            > ==John ff
>>            >
>>            > Csound mailing list
>>            > Csound@listserv.heanet.ie
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>>            >        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://flyndresang.no/
>>            http://www.partikkelaudio.com/
>>            http://soundcloud.com/brandtsegg
>>            http://soundcloud.com/t-emp
>> 
>>            Csound mailing list
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>>            Discussions of bugs and features can be posted here
>> 
> 
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Varies.

Regards,
Mike