Vista - Sound breaking up

Thanks for the previous help with my newbie questions.....I took the plunge
and installed VPC2007. I'm running Vista Home Premium as host and XP Pro as
guest.

I'm having a problem with sound on the guest. The sound is there, but the
audio sounds like it's breaking up with lots of short drop-outs or starting
and stopping as described in another post. It sounded like it was a resource
problem in the other discussion where it took a lot to emulate the sound
device, hence the poor audio. That may be my problem too....although I have
a 2GHz dual-core with 3G of RAM (512M allocated to XP). Does anyone have any
insights or solutions to this problem?

TIA
Tom

On Wed, 17 Dec 2008 10:05:01 -0800, Tom Bizon
<TomBizon@xxxxxx> wrote:
Did you install the Virtual Machine Additions in the guest yet?
Are you running on a laptop host? If so then have a look at the power
settings in order to adjust them for better performance.

--

Bo Berglund (Sweden)

"Bo Berglund" wrote:Yes....I did install the Virtual Machine Additions
I am running on a laptop (plugged in, FWIW). I'll give it a try later
(don't have that computer with me now). I assume you are suggesting a more
"high performance", but also more power hungry setting.

Thanks
Tom

I wasn't able to get it to work by changing power settings. I'm still having
the audio problems. Is it that the emulation of the sound card is consuming
more resources than my computer has or is it a potential driver problem?

My immediate workaround was to disable sound in VPC....but now I get the
annoying DOS beep when it needs to make an "attention" sound.

Thanks for any help
Tom



"Bo Berglund" wrote:

Tom Bizon wrote:I'm hoping too for some good hints coming from this thread. I also have
some sound issues where sounds sometimes echo/double-up and sometimes
break up.

I'm experiencing the same problem. I've allocated 1 GB of Memory to XP,
which should be plenty (I upped it from 512 MB's with no improvement). The
sound is just really choppy. Does anyone have any ideas?

Thanks,

Not really, I've never found a way around it, it's just hard for
virtualization products to do as it's pretty software intensive.

--
Bob Comer



On Tue, 13 Jan 2009 21:51:01 -0800, MLyons10
<MLyons10@xxxxxx> wrote:

Robert Comer wrote:Maybe that implies that the performance options maybe tweakable to make
a better sound experience (e.g. giving the host or guest more or less
CPU priority).

It's a shame that sound remains an issue. Sound just doesn't seem to be very
CPU when running an OS outside of Virtual PC, so I don't know why it would be
so poor within Virtual PC. I have already upped the CPU for the XP guest to
1 GB, but when I get home I'll crank it up to the max (Whatever that may be)
and see. When I run Task Manager it doesn't use much of XP's CPU, and on the
Host it also is not very demanding of the CPU. Which begs the question "What
does exactly cause this sound issue?" Is it the Virtual PC's interface
between the guest OS and the audio card? Virtual PC does have some
limitations as it relates to its ability to interact with certain things on
the Host Machine, such as printers and such. Is the Audio Card another one
of these limitations? It seems like something that should be supported...

On Thu, 15 Jan 2009 11:05:01 -0800, MLyons10
<MLyons10@xxxxxx> wrote:
Sound isn't an issue on the host, because the host has a sound card.
In a VM, the sound card is emulated via the CPU. Anytime the CPU gets
called for other processes/tasks, it will affect the sound, the slower
and older the CPU the more pronounced.
I rarely have this problem on my quadcores, or high-MHz dual-cores.

All VM software has limitations on how it connects to the host
hardware. The only thing that is directly accessible is the CPU, all
the other "hardware" in a VM is emulated, be it VPC, VMW Workstation,
or VirtualBox.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/