Okay, a few days later and:

1. That 2nd USB sound card I bought sort of sounds like ... crap
2. I've experimented with Virtual Audio Cable and found that I can
solve the problem and not even require that second sound card OR
Virtual Audio Cable.

The key is in a comment in the Virtual Audio Cable troubleshooting
file:

"Using VAC to route audio from the microphone, I hear an echo. How can
I cancel it?

An echo can appear if your audio connection scheme has some loopbacks
and/or multiple repeaters. For example, each audio card can repeat
(monitor) an input signal to its own output (the speakers). If
monitoring is enabled (input line is not muted), you will hear your
voice in the speakers even there is no audio application running.

If an application records an input signal and also reproduces (repeats)
it to the speakers, a signal copy is created, sounding as an echo. This
copy appears slightly later due to the buffering. Input audio signal
also could be copied to the speakers due to improper Virtual Cables
assignment in applications.

To avoid an echo, you should disable either input line monitoring in
the audio card or recorded data playback in the application. You can
control audio card monitoring status (volume and mute) in its volume
control panel (the mixer). To disable repeating in the application, see
application's settings. Also check your Virtual Cable connection scheme
to avoid possible loopbacks and parallel signal paths."

So I open up the Realtek HD Audio Manager, and look closely at the
line-in tab, and a bit of understanding begins to grow.

The line-in tab has both a Recording Volume as well as a Playback
Volume.  And sure enough, if I simply move the Playback Volume of the
line-in tab of the Realtek HD Audio Manager to 0, well, you guess it,

It's louder than ever. 

Nah, it's quiet.  No echo.  Line-in and then SBS wavein plugin
broadcast to my desktop and all around my place to the other
Squeezeboxen.


-- 
ja2038
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View this thread: http://forums.slimdevices.com/showthread.php?t=35718

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