From alsa-user-owner@alsa.jcu.cz  Thu Jan  7 19:18:51 1999
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From: Monty <xiphmont@mit.edu>
Message-Id: <199901071818.NAA16246@cutter-john.MIT.EDU>
To: alsa-user@alsa.jcu.cz
Subject: Re: 4 soundcards on a same machine and future of Multitrack 
In-reply-to: Your message of "Thu, 07 Jan 1999 09:17:11 +0100."
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Date: Thu, 07 Jan 1999 13:18:24 EST
Reply-To: alsa-user@alsa.jcu.cz
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>:Perhaps the SB PCI64 (Ensoniq audiopci / ES1370) cards are interesting for
>:you? These are PCI boards don't use ISA DMA, and have in addition 2 stereo
>:outputs. (ie. 2 in / 4 out). You'll still need some hardware modification
>:to sync the clocks.
>:
>:Frank.
>
>Please, could you explain why we have to synchronize the clocks ?

Because clocks drift.  The cheap clocks used in most computers and
sound cards will typically wander and drift several percent.  If you
record tracks on two different soundcards with a clock difference of
.5%, 10 minutes of audio will be out of sync three seconds at the end.

Monty


