Re: [iiwusynth-devel] Newbie getting warnings and pops/clicks

[Ken Ellinwood]

Excellent.  Thank you!

I tried doubling the default buffer and fragment sizes, and also enabling
set-UID for iiwusynth.  Both were very effective.  Especially set-UID in
regards to the warnings.  In fact, the first time I started the synth after
doing so, I thought that something was wrong since it produced no output at
all.  I think it would be nice to add a command line option which would enable
some user friendly command line interaction, like so:

iiwusynth --command-line-prompt --midi-device=/dev/midi00 jonnypad6.sf2
Welcome to iisusynth.  Not sure what to do next?  Try 'help' or 'help all'.
synth>  

Ken

--- Markus Nentwig <address@hidden> wrote:
> Hi,
> 
> the warnings are OK, I get the same.
> You can get rid of them if you run the synth as root or do chmod a+s
> /usr/bin/iiwusynth.
> It's not necessary, but it gives the synth higher priority. That alone
> can avoid dropouts.
> 
> Then try different options for buffer size and fragment number (This
> applies both to OSS and ALSA driver. But the same device can behave
> differently, for example Maestro3 chip).
> The command line options are -c (fragment number) and -z (buffer size in
> frames), as in "iiwusynth -c 16 -z 64 johnnypad.sf2".
> Find out, what your card can handle. For both parameters, smaller
> numbers result in lower latency, but less tolerance against dropouts.
> For example (from memory, can't guarantee for those)
> Maestro 3 under OSS: -c 16 -z 64
> Same under ALSA: -c 16 -z 128
> Edirol UA-1 USB: -c 3 -z 45
> Edirol UA-100 USB: -c 4 -z 45, produces periodic dropouts nonetheless
> (driver problem).
> Hammerfall DSP: -c 2 -z 64
> 
> If that does not help, look at the HDD lamp - do the dropouts coincide
> with the OS flushing the buffers?
> One cause of regular dropouts on my machine is the window manager
> (icewm) trying to read the APM battery status once per second. When I
> disabled the battery display, dropouts were gone.
> If in doubt, kill X and run the synth from the console.
> 
> Let me know, if you succeed!
> 
> -Markus
> 


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