Date: Wed, 21 Jan 2004 09:48:04 +0100 From: "Daan Vreeken [PA4DAN]" <Danovitsch@Vitsch.net> To: Ethan <telmnstr@757.org> Cc: FreeBSD-questions@FreeBSD.org Subject: Re: USB sound device questions (multiples!) Message-ID: <200401210948.04982.Danovitsch@Vitsch.net> In-Reply-To: <20040120205110.N38787-100000@users.757.org> References: <20040120205110.N38787-100000@users.757.org>
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On Wednesday 21 January 2004 02:53, Ethan wrote: > Hello all, > > I am thinking about trying to use 4 to 6 USB "sound devices" on a sing= le > FreeBSD system. > Can anyone advise me if I will run into a case where on every reboot t= hey > all get different pcmX devices? Or will they stay static? If they are all plugged in during boot they will get probed in the same o= rder=20 every time you boot, so yes, they will be static. Be sure to calculate if you have enough bandwidth available to drive such= a=20 great number of devices at the same time though : 48KHz * 16-bits sample * stereo * 6 devices =3D about 48 * 2 * 2 * 6 =3D 1152 KB/sec . That's about the maximum you can get over USB 1.0, so I'm not sure if you= will=20 be able to use them all at the same time at maximum playback rate... So i= t=20 depends on the quality and sample-rate you need. grtz, Daan
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