From owner-freebsd-multimedia  Thu Oct  3 16:29:48 2002
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Date: Thu, 03 Oct 2002 16:24:18 -0700
From: Ken Marx <kmarx@vicor.com>
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To: FreeBSD Multimedia <freebsd-multimedia@FreeBSD.ORG>
Subject: static w/ vchans > 0
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Hi,

On 4.4-RELEASE-p13, I have pcm0: <Creative CT5880-C>,
which requires virtual channels to do full duplex
audio:

pcm0: <Creative CT5880-C> at io 0x9000 irq 15 (1p/1r/2v channels duplex)

This works fine, but the playback tends to be pretty fuzzy/static-y.
I assume this is due to interleaving the dma (but could
be wrong, of course).

So, my questions are:

1. What causes this (if my guess is wrong)?
2. Is there a remedy short of getting a muti-channel card?

If the the anwer to #2 is no, then:

3. does anyone have a recommendation for an inexpensive alternative?

This is for a production system with as many as 100+ machines.
So cost is an issue.

Thanks,
k.
-- 
Ken Marx, kmarx@vicor-nb.com
We have to move. We must march shoulder to shoulder and slam dunk the 
milestones.
		- http://cgi.bigshed.com/~kmarx/cgi-bin/speak.cgi

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