I'm playing (for example) Dido - No Angel, track "Isobel", and according to the hdspmixer tool, at the end of the track the drums have transients that go greater than 0db, and this causes nasty metallic crackles on my RME 9632 (tested with both Alsa and OSS interfaces). Without looking at the code, I'm wondering if there is an overflow occuring, ie something unsigned going into a signed value and causing this... However, it doesn't seem that likely, for example if you turn up the middle layer of mixer controls and then turn down the last layer of output mixer controls then as long as the red clip light isn't on then everything is still ok, ie the crackle isn't occuring as a result of the first layer of software mixing, it purely seems to be something happening *after* the last mixer control
You can also simulate this simply by turning up the mixer controls so that normal music starts to clip. Same effect.
Two points to note, first I don't remember getting this on an alsa snapshot from about 1-2 months ago, so I'm thinking it's a driver issue, rather than a feature of this card? Secondly, before now I couldn't use the card at all with many apps, I would just get constant over-runs and other problems. So thankyou for fixing those problems!
Just a heads up, this card still doesn't work with mplayer 1.0 pre3. The sound appears to be playing too slowly, and several times a second there are "xruns" reported (which makes sense). I will try and rip out the mplayer audio code and make up a test app so that I can experiment further with this.
Thanks to everyone who has made Alsa what it is today!
Ed W
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