[fluid-dev] Fluid/qsynth/rosegarden not giving stable audio output after a while-Blame Jack

[Marc Brevoort]

Hi,

> Are you by any chance using an SB-Live with 44.1khz samplerate? If so this 
> is a known issue with this card, it works much better at 48khz.
> If not... I don't know ;)

Since this message I've identified the problem to be with the Jack Audio 
Connection kit only. If I configure qsynth/fluidsynth to playback directly 
via ALSA, the problem does not occur (of course, with the drawback that the 
synth output cannot be routed, for example, to freqtwear or rezound).

Also, yes, I was running at 44.1 khz. The music is intended for burning to 
CD, and resampling from 48 khz to 44.1 in the end of the process introduces 
some (albeit not a lot) loss of quality. Also I figured running at 44.1 
should allow for about 10% more instruments because there's less to 
calculate.

I realize that the problem is attributed to the card itself (an audigy, not 
a live, but also using an emu10k1, so it has the same problem). But if 
playing direct-to-ALSA can play back smoothly through the hardware at 
44.1kHz, I see no reason why Jack using ALSA driver shouldn't be able to do 
the same, so to me this looks like a software problem. For now I'm running 
Jack at 48 khz.

The Jack list recommends this (playing at 48 khz) stating "please see if the 
problem still occurs then so that we can isolate it being a problem with 
jack or not), which seems to solve the audio stability problem, however Jack 
still quits on me after a while, so I'll take this problem to that list. 
They'll be thrilled to find out this particular problem in the end seems to 
be a software issue ;)

Best regards,
Marc Brevoort

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