Re: rme 9632 crackling when sound > 0db

[Ed Wildgoose <lists@wildgooses.com>]

Joachim Deguara wrote:

> The good news: you don't have a driver problem!  But it sounds like 
> you have a Wordclock problem.  Namely, your rme 9632 has a different 
> clock than your playback device (D/A) and they are not in Sync.  Check 
> the setting for who is (and should be) Wordclock Master and take 
> adjust accordingly.  You can set the mode of synchronisation for you 
> card by editing /etc/asound.state and the running "alsactl restore".


Hi, Thanks for the thought, but I don't see how this could be the 
issue?  I am reading input from the HD, writing it to the card via 
either oss or alsa, and the output is analogue to a pre-amp and then on 
to an amplifier.  The crackle only occurs when I use +4db as the output 
level, and then either find a song which clips anyway, or crank up the 
mixer so that the output clips.  It could actually be some sort of 
electrical issue at the pre-amp to be fair, it's just that I don't 
remember it happening before?  It doens't seem to be a problem if I drop 
the output level to the -10bdv setting for example.

The main thing I would prefer to debug right now anyway is why mplayer 
doesn't work with this card.  A cursory glance at the mplayer output 
code suggests that everything looks fine...  Oh well, will need to break 
out that code and study it a bit more - most other apps are working now 
though

Thanks

Ed W


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