From owner-freebsd-questions@FreeBSD.ORG Wed Jan 21 00:47:38 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 361FD16A4CF for ; Wed, 21 Jan 2004 00:47:38 -0800 (PST) Received: from Vitsch.net (b74143.upc-b.chello.nl [212.83.74.143]) by mx1.FreeBSD.org (Postfix) with ESMTP id F372D43D45 for ; Wed, 21 Jan 2004 00:47:35 -0800 (PST) (envelope-from Danovitsch@Vitsch.net) Received: from FreeBSD.Danovitsch.LAN (b83007.upc-b.chello.nl [212.83.83.7]) by Vitsch.net (8.12.3p2/8.11.3) with ESMTP id i0L8l3Xe015948; Wed, 21 Jan 2004 09:47:04 +0100 (CET) (envelope-from Danovitsch@Vitsch.net) Content-Type: text/plain; charset="iso-8859-1" From: "Daan Vreeken [PA4DAN]" To: Ethan Date: Wed, 21 Jan 2004 09:48:04 +0100 User-Agent: KMail/1.4.3 References: <20040120205110.N38787-100000@users.757.org> In-Reply-To: <20040120205110.N38787-100000@users.757.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Message-Id: <200401210948.04982.Danovitsch@Vitsch.net> cc: FreeBSD-questions@FreeBSD.org Subject: Re: USB sound device questions (multiples!) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Jan 2004 08:47:38 -0000 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