Does any Free/Open Source recording software for Mac work with Snow Leopard yet?

[satl]

I'm using M-Powered Pro Tools, but the buffer setting doesn't go low enough to monitor back with. There is too much of a delay.

I need something else to use simultaneously with ProTools for monitoring. I have GarageBand, which helps, but there's still a slight delay, and it won't support 48 kHz.

I'm using a ProFire Lightbridge.

Thanks,
Shane