Here it is:
https://github.com/LMMS/lmms/issues/276
2014-02-05 Jonathan Aquilina <[email protected]>:
> File an issue and provide the two samples the one wiht distortion and the
> other with out.
>
> On Wednesday, February 05, 2014 03:15:05 PM Tobiasz Karoń wrote:
> > I don't really know how the bride works and if it's just a config hack
> > (making ALSA output to a virtual JACK device), or some program passing
> data
> > through...
> >
> > 2014-02-05 Jonathan Aquilina <[email protected]>:
> > > I am no expert I have a hunch it potentially has somethign to do wiht
> the
> > > bridge, but I would say more investigation is warrented.
> > >
> > > Is the bridge versions and if so do jack have a newer version we should
> > > try
> > > and use?
> > >
> > > On Wednesday, February 05, 2014 03:09:50 PM Tobiasz Karoń wrote:
> > > > I did - I switched to JACK back-end, and the distortion disappeared.
> > > >
> > > > 2014-02-05 Jonathan Aquilina <[email protected]>:
> > > > > You tried to bypass the alsa jack bridge all together?
> > > > >
> > > > > On Wednesday, February 05, 2014 03:05:29 PM you wrote:
> > > > > > It sounds to me like some bad interpolation. Maybe ALSA→JACK does
> > > > >
> > > > > something?
> > > > >
> > > > > > However why rendering is affected?
> > > > > >
> > > > > > Btw: I captured the live output with jack_capture.
> > > > > >
> > > > > > 2014-02-05 Jonathan Aquilina <[email protected]>:
> > > > > > > Could this potentially have something to do with the latency of
> > >
> > > alsa
> > >
> > > > > > > or
> > > > > > > pulse
> > > > > > > compared to jack?
> > > > > > >
> > > > > > > On Wednesday, February 05, 2014 03:00:17 PM Tobiasz Karoń
> wrote:
> > > > > > > > What's strange - the distortion is also present in rendered
> WAV
> > > > > > > > file,
> > > > > > > > however it sounds different.
> > > > > > > > When using JACK back-end rendered file has no distortion
> either
> > >
> > > with
> > >
> > > > > > > > Fastest or Best interpolation method (they produce identical
> > > > > > > > output).
> > > > > > > >
> > > > > > > > 2014-02-05 Tobiasz Karoń <[email protected]>:
> > > > > > > > > Using this sample I've just spotted some distortion in the
> > >
> > > output.
> > >
> > > > > > > > > I've
> > > > > > > > > calculated the difference with the original sample - it's
> > >
> > > included
> > >
> > > > > as
> > > > >
> > > > > > > > > *distortion.flac*.
> > > > > > > > >
> > > > > > > > > I've made a few tests and I see that it happens with ALSA
> > >
> > > output
> > >
> > > > > > > (bridged
> > > > > > >
> > > > > > > > > back to JACK) - JACK output doesn't distort the output.
> > > > > > > > > I wonder if this is caused by LMMS or ALSA, or JACK-ALSA
> > >
> > > bridge?
> > >
> > > > > > > > > 2014-02-05 Tobiasz Karoń <[email protected]>:
> > > > > > > > >
> > > > > > > > > I've cut it down to 14kB :D
> > > > > > > > >
> > > > > > > > >> Less silence in the beginning and end, will sync better.
> > > > > > > > >>
> > > > > > > > >>
> > > > > > > > >> 2014-02-05 Tobiasz Karoń <[email protected]>:
> > > > > > > > >>
> > > > > > > > >> How about including this one with LMMS?
> > > > > > > > >>
> > > > > > > > >>> --
> > > > > > > > >>> Tobiasz *unfa*
> > > > > > > > >>>
> > > > > > > > >>> -----BEGIN GEEK CODE BLOCK-----
> > > > > > > > >>> Version: 3.1
> > > > > > > > >>> GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P?
> > >
> > > L+++>++++$
> > >
> > > > > E?
> > > > >
> > > > > > > > >>> W++>$ !N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+?
> > >
> > > !t(+)
> > >
> > > > > 5?
> > > > >
> > > > > > > > >>> !X
> > > > > > > > >>> !R+
> > > > > > > > >>> tv b+>+++ DI>+ D+ G e h-->- !r y--()
> > > > > > > > >>> ------END GEEK CODE BLOCK------
> > > > > > > > >>
> > > > > > > > >> --
> > > > > > > > >> Tobiasz *unfa*
> > > > > > > > >>
> > > > > > > > >> -----BEGIN GEEK CODE BLOCK-----
> > > > > > > > >> Version: 3.1
> > > > > > > > >> GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P?
> > >
> > > L+++>++++$
> > >
> > > > > E?
> > > > >
> > > > > > > W++>$
> > > > > > >
> > > > > > > > >> !N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+? !t(+)
> 5?
> > >
> > > !X
> > >
> > > > > !R+
> > > > >
> > > > > > > > >> tv
> > > > > > > > >> b+>+++ DI>+ D+ G e h-->- !r y--()
> > > > > > > > >> ------END GEEK CODE BLOCK------
> > > > > > > > >
> > > > > > > > > --
> > > > > > > > > Tobiasz *unfa*
> > > > > > > > >
> > > > > > > > > -----BEGIN GEEK CODE BLOCK-----
> > > > > > > > > Version: 3.1
> > > > > > > > > GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P?
> > >
> > > L+++>++++$
> > >
> > > > > > > > > E?
> > > > > > >
> > > > > > > W++>$
> > > > > > >
> > > > > > > > > !N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+? !t(+)
> 5?
> > > > > > > > > !X
> > > > >
> > > > > !R+ tv
> > > > >
> > > > > > > > > b+>+++ DI>+ D+ G e h-->- !r y--()
> > > > > > > > > ------END GEEK CODE BLOCK------
>
>
--
Tobiasz *unfa*
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GIT/MU/P d->-- s+:-(--)> a? C++(+++)>$ ULC+(++)>$ !P? L+++>++++$ E? W++>$
!N-? !o--? K-? !w-- O? !M-- V? PS++ PE++ !Y+ !PGP+? !t(+) 5? !X !R+ tv
b+>+++ DI>+ D+ G e h-->- !r y--()
------END GEEK CODE BLOCK------
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