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sound boards (long)

To: <writelog@contesting.com>
Subject: sound boards (long)
From: w5xd@alum.mit.edu (W. Wright, W5XD)
Date: Thu, 18 Feb 1999 14:35:23 -0000
Hi Jerry,
Ron forwarded me your message.

I don't have time as I read this to respond to every detail, but here are a
couple of things:

1. You are the second person to report that WL is failing to manipulate the
sound board mixers correctly on a PCI128 card. If you have time to work with
me on this, I can send you a  diagnostic program that I'll need you to run
and report to me what it does.

2. WL has an "uneven" diddle under certain circumstances. Yes. The worst is
when running stereo and on Windows NT. Its not very pleasing to the ear, but
its harmless. The reason the problem happens is that WL must stay ahead of
the sound board on transmit--that is, must have at least one transmit buffer
in the sound board at all times. If WL fails to keep a buffer in the board,
the transmit tone drops out completely. You shouldn't be hearing that. The
worst unevenness happens on stereo because I discovered empirically that
when running stereo the sound board demands more buffering ahead to prevent
the drop outs. By the way, "stereo" is just the name WL puts on the user
interface. The thing that causes the sound board to be more demanding is
full duplex operation--simultaneous transmit and receive which only happens
in WL when you tell it "stereo". So the unevenness comes from the fact that
when WL has nothing to transmit, it puts an extra buffer of continuous space
tone into the sound board buffer.

3. The horizontal hash problems don't sound like anything the WL software
can do anything about.

Wayne

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