[LAU] Audio performance in guest VM (MS-Win) on Linux host

Banibrata Dutta banibrata.dutta at gmail.com
Sat Aug 10 13:14:49 CEST 2019

Hi Ralf,

Thanks for taking time to reply. Regarding the April fool hoax, I am not
sure I understood what was obviously suspicious (thanks to my ignorance). I
do have a Mountain Lion MacOS setup on Oracle Virtualbox VM running on my
Linux host, alas with no sound. Sound was one of the few remaining problems
that I couldn't fix, but I thought it to be more because of a working kext
that is compatible with the emulated (even crappy) sound device (s.a. SB10
or intelHDA... although I don't think IntelHDA is that bad for say amateur
home-studio work).

The Windows 10 guest VM is able to render sound alright (from a browser),
so audio out didn't seem to be too much of an issue. Hadn't attempted
recording in the guest yet. The 3 applications (requiring audio in-out) I
had in mind for Windows guest were:
1. Mobius looper - It requires audio in/out and MIDI in (for foot-switch
controls). This software is available only for Windows and Mac. Yet to try
with Wine.
2. Skype for Business - Currently I am using SfB Android application on a
super-slow Android VM on Virtualbox, apart from it being feature-crippled.
I need it to join my office call from my home PC. Wanted to see if I could
use the fully feature Windows client in in Windows10 guest. Tried without
success on Wine.
3. Guitar Rig5 - Cab/Amp modelling, effects. I've used Guitarix and
Rakarrack, but miss the arguably better modeling that GR5 offers. Tried
without success on Wine.

The MIDI input to the VM would be using serial-over-USB from an Arduino
based DIY foot-controller that encapsulates MIDI over serial (over USB).
I've done some microprocessor and single board computer development on VM,
I know that the serial ports work reasonably well in VMs.


On Sat, Aug 10, 2019 at 2:37 PM Ralf Mardorf <ralf.mardorf at alice-dsl.net>

> Hi,
> what kind of audio apps do you want to run in a Windows guest?
> Usually it's vice versa, audio software does work when running it under
> wine, but does not work, when running it in a Windows guest, since
> Linux does access the hardware and provides the drivers.
> Usually a virtual machine provides to chose between a few audio
> device emulations and has got a bridge to the Linux host to access the
> real sound card via ALSA, OSS or a sound server. This does mean, that
> Windows does access a faked (virtual, emulated) crappy sound card and
> not the real sound card.
> I don't know if there even is a way to get a bridge for MIDI, maybe by
> enabling serial ports.
> Btw. an April fool hoax does address this issue:
> https://lists.ubuntu.com/archives/ubuntu-users/2019-April/296577.html
> Regards,
> Ralf

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