Rec for Sound Card for use in Proxmox with PCIe Passthrough to Linux or Windows Guests?

[SInisterPisces]

Hello,

I need to pass an actual PCIe x1 sound card to Linux and Windows guest VMs. Crisp, as-good-as-bare-metal sound is a requirement for these VMs, unfortunately.

It's been about 25 years since I've needed to buy a sound card, and I have no idea what to get that'll actual work in Linux and Windows. I do know that Creative's Linux support is lol no, so I have no idea what to get.

What are y'all using for PCIe audio where crisp, low-latency spoken word audio and music is the use case? In particular, I'm looking to be able to decode and playback software defined radio data live.

 

[leesteken]

I've always used PCI passthrough of the motherboard on-board audio (old Intel and Ryzen) for movies and games but maybe that was just luck. Also, USB headsets (Audeze and HyperX) but only with a PCIe passed through USB controller (for proper low-latency and less overhead). But everything I used is probably not up to your audio standards.
If you already have a USB controller passed through then that would be the safest route if you can find out Linux support for the USB audio device of your choice on the internet.