Official Mumble VoIP Forums

I'm not quite sure I understand. Are you using multiple Mumble clients? Or are you talking about the overlay of one Mumble client appearing in two Eve windows?

Are you running the same program (exe) for the multiple eve windows?
I’m not sure I understand your question. Mumble can be used entirely independent of games. So yes, of course you can use it on multiple platforms and connect to the same server to talk.
You’re welcome :)
You can use the whisper to shortcut to talk to only a specific user. In the Data column in the shortcut editor you can set the user as a target.

So this should work just fine with only one Windows client and two PTT whisper shortcuts set up.
Do you experience the issue at specific times, after specific actions? E.g. when just starting out using it? Being able to reproduce it would be most helpful. Checking the mic volume in Mumbles settings, and Windows audio input device settings would be helpful to see if it is a mic input volume issu...

What operating system are you using?
How did it work then? Did you connect to your servers IP address? A domain is a named alias for an IP address. Once the domain is set up there is nothing you have to do on the Mumble server specifically. If connecting to the IP worked it should also work with the domain address. The port has to be s...
This is about the Mumble client?

Did you verify that Mumble stores its settings, and that storage is persistent across reboots?

For the path see

Personally I’m not familiar with the Raspberry Pi and how it handles storage.
So other participants hear them fine?

When it happens, can you check your user information for late packets and packet loss?

I'd consider a networking issue more likely for now.
How do you measure the audio round trip latency?

WASAPI beying greyed out just means there is no other option. It's the standard system - which is fine.