Re: [fluid-dev] MIDI stutters when I move windows

[Menteco]

Josh Green wrote:

> If you are just running FluidSynth stand alone, then its just
> sufficient to run it as root, ...
>  
If I play a MIDI file directly with fluidsynth (as root or not) it plays 
twice as slow than if played with KMid, as if fluidsynth can't get the 
tempo info from the MIDI file.
No matter if I play the MIDI file with KMid of fluidsynth, audio dropt 
when I move any window, even when logged as root.
I am using kernel 2.6.0-test9, which only has a preemptive kernel option 
and no other low latency hacks.

> With 2.4.x kernels these days, you can usually get fairly good response
> without applying any low latency patches, but if you want that real
> hardcore professional feel, it makes sense
The problem is that just kernel 2.6x has native support for ALSA. It was 
relatively easy to set ALSA and friends with it. With kernel 2.4x I 
would have to install everything manually, disable the default OSS audio 
stuff, etc, etc.

> I imagine if you are just
> trying to play a MIDI file for web pages, you probably don't need lowlat
> patches.
>  
I am actually a desktop musician (www.mp3.com/menteco) and plan to use 
Rosegarden, but first I need to start with the simple questions/tasks 
since I am just a 3 month old full-time Linux user/migrator.

> On a some what unrelated note I'm just realizing right now that there
> isn't a way to set the interpolation algorithm. This has a drastic
> effect on CPU consumption and the like. There should probably be a
> settings parameter for it. I believe the default is 4th order
> interpolation, but I suppose linear could be used for much less CPU
> usage, I haven't tested it much myself. Cheers.
>     Josh Green
>  
I'm not sure but may be part of the output when I launch fluidwyth has 
something to do with interpolation:
debian18:/home/menteco/swami# fluidsynth -m alsa_seq 8MBGMSFX.SF2
** Using format s16, rw, interleaved
fluidsynth version 1.0.3...
Cheers,
Paul www.menteco.tk