From owner-freebsd-multimedia@FreeBSD.ORG  Wed Feb 16 02:55:24 2005
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From: Kazuhito HONDA <kazuhito@ph.noda.tus.ac.jp>
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cc: freebsd-multimedia@freebsd.org
Subject: Re: Success with Creative SB Live! 24 Ext
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Hello,

I have `Soundblaster Live! 24-bit External', too.
And I'm using it with FreeBSD 6-current/i386.
The current codes for USB audio devices have been patched along some PR's.

http://www.freebsd.org/cgi/query-pr.cgi?pr=75274
http://www.freebsd.org/cgi/query-pr.cgi?pr=75276
http://www.freebsd.org/cgi/query-pr.cgi?pr=75311

These patches may satisfy some your wishes.
But some USB devices have only few fixed sampling rates,
and ones of my Soundblaster Live! 24-bit External 
are 44.1 kHz, 48 kHz, and 96 kHz.
If we play a sound source in another sampling rate,
some USB devices must play in a different sampling rate and out of pitch
with FreeBSD 4 or 5, and don't play with FreeBSD current.
So you had better use a userland mixer, e.g. EsounD or aRts.

Kazuhito HONDA