I have audio file with 192Khz/24bit sound, and Revo 5.1 and driver for Snow Leopard. This driver is not official, and it is only the kext, without any GUI, and I can't see sound quality playing right now. I just set up in Audio Midi Setup App sound format of 192Khz. How can I see be sure the sound playing in 192/24 quality, not just 192/16? Is 24bit/16bit sound switching begins automatically?
I used to own one of these cards and used it on a Windows PC. If I'm not mistaken, M-Audio (now owned by Avid) no longer supports this card. It's been declared obsolete and orphaned. Good luck.