[mad-user] Problem with 24 bit output on M-Audio Revolution 7.1

[Jason Clouse]

Greetings!

I just got hold of an M-Audio Revolution 7.1 and decided to start
playing around with it. I've got the latest CVS of ALSA and
AlsaPlayer installed and I can successfully get sound of the card.

I'm having some trouble, however. I read that the Revolution has a
pure 24/192 signal path from start to finish, and that madplay can
take advantage of this. I tried running madplay with the
'--bit-depth=24' option but it told me that the card couldn't handle
24 bit output, and that it was dropping back to 16. Did I miss
something?

Jason Clouse

[Rob Leslie]

Post by Jason Clouse
I just got hold of an M-Audio Revolution 7.1 and decided to start
playing around with it. I've got the latest CVS of ALSA and
AlsaPlayer installed and I can successfully get sound of the card.
I'm having some trouble, however. I read that the Revolution has a
pure 24/192 signal path from start to finish, and that madplay can
take advantage of this. I tried running madplay with the
'--bit-depth=24' option but it told me that the card couldn't handle
24 bit output, and that it was dropping back to 16. Did I miss
something?

The ability to use 24-bit output depends as much on your audio driver
as the card itself. Which audio output module are you using with
madplay?

[Jason Clouse]

Post by Rob Leslie
The ability to use 24-bit output depends as much on your audio driver
as the
card itself. Which audio output module are you using with madplay?

ice1724 (Envy24HT). I did get 24 bit output by redirecting madplay to
stdout, then piping it to 'aplay'. Perhaps madplay is trying to use
the OSS interface?

Jason