Speaker strange acoustic noise

R

RachelL1

Member
Dear All,
I work with Parallels 12 Pro and Windows 10 on my MacBook Pro, Speaker and sound on the new Mac are great, but when I activate the speakers on Parallels or move the volume, it makes a very strange acoustic noise from the speakers (only in Parallels), does someone know why or from where this can come from? (when I move the volume louder the noise also becomes louder)
would appreciate your help this is quite unsetting
thanks in advance
Regards Rachel
 
Dear Maria,
thank you for your reply, yesterday I have reinstalled the Parallels Tools and played again on the windows side with the Volume or the speakers, then it was fine, but today I have opened AutoCad and now again for a short time this swoosh (difficult to explain)
for your second question, no I have not installed any drivers.
any other idea??
 
RachelL1 said:
Dear Maria,
thank you for your reply, yesterday I have reinstalled the Parallels Tools and played again on the windows side with the Volume or the speakers, then it was fine, but today I have opened AutoCad and now again for a short time this swoosh (difficult to explain)
for your second question, no I have not installed any drivers.
any other idea??
Click to expand...
Thanks a lot or your reply. Does the issue reoccur with AutoCad only?
 
Dear Maria,
Not only with AutoCad I had this also when I added a external drive to move datas. I still try to find out some regularity but since yesterday it not happen any more. difficult to tell, in the parallels properties I have the speakers/sound the output and input as standard is this correct?
 
Hi RacheL1, yes, you are correct. Switch driver mode to WaveCyclic.
Note: Ensure that snapshot is created (Virtual Machine > Take a snapshot) before the below steps are followed.
Try one option at a time and check if it resolves the issues:
Use Boot flag "devices.audio.clock=1" (to check guest time logic):
- Start Parallels Desktop without starting the virtual machine
- Go to virtual machine configuration http://kb.parallels.com/en/117287 > Hardware > Boot order
- In the field Bootflag please type in: "devices.audio.clock=1" (without quotes)
- Close the configuration window and start the virtual machine
Change the Windows OS registry:
- Start the virtual machine
- Go to Start and type in "regedit"
- Find the following branch:
Switch driver mode to WaveCyclic:
HKLM\SYSTEM\CurrentControlSet\Control\Class{4D36E96C-E325-11CE-BFC1-08002BE10318}\\OverrideCaps\WAVERTMODE = 0_
Switch driver mode to low-precision position:
HKLM\SYSTEM\CurrentControlSet\Control\Class{4D36E96C-E325-11CE-BFC1-08002BE10318}\\OverrideCaps\IGNOREPICB = 0x02_
 
Dear Paul Chris,
Thank you very much for your reply to my question, I need you're help again here, I have made the first step as explained above (notice in Bootflag), this have helped already a lot but since yesterday I noticed that the problem is not 100% solved as it happen again, so I tried to follow the steps on the registry, but here I have a problem as I cannot find HKLM link, I have uploaded a print screen of the registry, I have also tried to search in the registry and also search in the explorer for this file but no luck, I guess something I'm doing wrong maybe you can help me again? thanks in advance, Kind Regards Rachel
 

Attachments

RachelL1 said:
Dear Paul Chris,
Thank you very much for your reply to my question, I need you're help again here, I have made the first step as explained above (notice in Bootflag), this have helped already a lot but since yesterday I noticed that the problem is not 100% solved as it happen again, so I tried to follow the steps on the registry, but here I have a problem as I cannot find HKLM link, I have uploaded a print screen of the registry, I have also tried to search in the registry and also search in the explorer for this file but no luck, I guess something I'm doing wrong maybe you can help me again? thanks in advance, Kind Regards Rachel
Click to expand...
HKLM stands for HKEY LOCAL MACHINE. You can find out this option under the registry settings.
 
Dear Paul Chris,
sorry about this, it is absolutely not my profession ... but I could have searched better.
Actually I could change the first one WAVERTMODE from 1 to 0 but the second one IGNOREPICB I can't find under Override Caps I have added another print screen to show what I see
Thanks in advance
Kind Regards
Rachel
 

Attachments

RachelL1 said:
Dear Paul Chris,
sorry about this, it is absolutely not my profession ... but I could have searched better.
Actually I could change the first one WAVERTMODE from 1 to 0 but the second one IGNOREPICB I can't find under Override Caps I have added another print screen to show what I see
Thanks in advance
Kind Regards
Rachel
Click to expand...
That's okay. Now, please reinstall Parallels Tools and let us know how it works.
 
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