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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