Re: [timidity-talk] Jack and timidity: one audio channel per MIDI instrument

[Eric W. <ew...@bi...>]

On Tue, 16 Jun 2009, laurent schwartz wrote:

> Hi,
>
> Is it possible to have a channel for each MIDI instrument used by timidity
> in order to apply some audio effect on them using jack connection kit ?
>
> For example, i would like to apply a custom guitar audio effect on the
> channel that uses SteelGuitar or the Drum closed hit hat ...
>
> Thanks for your advice,
> Laurent

I don't know the specifics of the Jack interface, but the core mixing
routines in TiMidity mix all the individual MIDI channels down into
2-channel stereo prior to passing them any output interface.  I haven't
looked at the server code, so perhaps this is different now, but I'd guess
that TiMidity is probably passing pre-mixed 2-channel audio to jack, and
that there is no way to pass individual pre-mixed rendered MIDI channels
to jack, at least not without significant changes to the TiMidity source.
As I said, I'm not familiar with the server code or jack interface, so
someone familiar with the jack interface can correct me if I'm wrong here.

-Eric