Re: [iiwusynth-devel] CVS: Chorus API and command line, ltconfig problem after ./configure

[Peter Hanappe]

M. Nentwig wrote:
> Hello all,

Hi Markus,

> now the chorus has command line control and an API interface.

Great!

> I have further fixed / tried to fix the problem, that './configure'
> required 'ltconfig ./ltmain.sh' to be run before make. 'libtoolize -f'
> in autogen.sh creates symlinks for config.guess, config.sub and
> ltmain.sh. Therefore, these three files are now deleted from CVS.
> Please try, if
> ./autogen.sh
> ./configure
> make
> make install
> works properly and let me know, if there are still problems (or new
> problems...).

Completely agree on the libtoolize stuff.
Did you add libtoolize in autogen.sh? I did find it so I added it
in CVS.

> About the chorus: The command line interface has now functions to set
> the chorus parameters.
> Internally, the number of samples for interpolation is just high enough
> to keep aliasing inaudible at the default setting (to use as little CPU
> time as possible). More 'drastic' chorus settings are possible, but the
> current chorus may produce audible aliasing - the notorious
> spaceship-landing-sound. It's easy to fix this - increase the number of
> interpolation samples in iiwu_chorus.c.

I saw you've been doing major changes on the chorus stuff. That means
it probably works now! I haven't tested it yet but will do the coming
week as I prepare for LinuxTag. I made some small esthetic changes
(formatting). Hope you don't mind.

I wondered if we could reuse the resampling technique used in the 
oscillator for the sample interpolation in the variable delay line.
The oscillator uses a four point interpolation. The fractional part
of the delay is mapped to an index between 0 and 256. The index is
then used to look up the interpolation coefficients in a table.
I'll try to take some more time to analyze the code of the chorus
module to see if it's worth considering.


> Some hardcoded chorus presets might be useful; send me your
> good-sounding parameter combinations!

Yes, it will be good to have presets.



> Cheers

Cheers for all the improvements!
Peter

> Markus
>
>
> _______________________________________________
> iiwusynth-devel mailing list
> address@hidden
> http://mail.freesoftware.fsf.org/mailman/listinfo/iiwusynth-devel