EMU 0404 USB little problems

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Hello,

I recently acquired this interface and compiled the latest stable
versions (1.0.16) of alsa-driver, alsa-firmware, alsa-lib and
alsa-utils.

For the moment, I can achieve playback through this interface.
However, I have two little problems:
1) I am not able to change the sampling rate at which the interface
operates, under Linux
2) (the most important one) While playing back, I can hear some
periodic series of clicks. They last about 1-2 seconds and are not
very loud, but not silent enough to be ignored ;) This happens at both
the sampling rates that the driver currently supports:
   - at 44.1kHz, the serie of clicks occurs once at about 25-30 seconds
   - at 48kHz, this interval changes to about 35 seconds.
This problem seems to be somehow related also to the material played
back, because I generated a 'silence' wav file and the clicks do not
occur when playing back this one, but are always appearing in normal
(audible) material.
Well, I would like to know if there is any way to avoid this issue (or
at least, what is the cause?). What I do know is that I'm not the only
one experiencing this type of problem, but it is very unclear to me if
anybody actually managed to get a *totally* clean playback, without
these periodic clicks.

Thanks,
Adi

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