Distorted soundrecording from macos and ios clients on Terminal Server 2019 under VMWare vSphere

Question

Hi all, we use Macs as PACS Clients to connect to a Terminal Server 2019 that is run on a VMWare vSphere server.

After switching from TS2012 to TS2019 we cannot use the speech recognition of our RIS anymore. The sound quality on TS2019 is really bad, voice sounds too fast with a lot of skips in between. This happens with all macos and IOS clients I could get my hands on, running Monterey to ventura and Intel and Apple silicone as well as year old Microsoft remote desktop clients to the newest beta.

I installed Audacity to look further into this. As long as I use Directplay or MME as Audio host recordings gets distorted, as long as I use WASAPI it's fine. I cannot tell our RIS to use WASAPI though. We tried different Bandwith Settings (22 - 48 kHz, Mono/Stereo) in macos and audacity to no avail. Setting the VM to latency sensitive seems to have minimal effect.

Using Windows RDP Clients or connecting macos Clients to a TS2012 remedies the distorsions. We set up a testversion of TS2022, the problem persists. Also all settings of Soundquality in RDP have no effect.

I'd be happy for any further insights to this problem.

Best regards

Tobias