Sound finally works

You have to change a setting in /etc/libvirt/qemu.conf, change the host audio or whatever it’s called to 1. Then change the xml file. You have to add four environment variables to it.

QEMU_AUDIO_DRV=pa
QEMU_PA_SAMPLES=8192
QEMU_AUDIO_TIMER_PERIOD=99
QEMU_PA_SERVER=/run/user/1000/pulse/native

Can’t remember the location of the XML file. But to add custom environment variables, instructions here. Those variables were stolen from Linux Mint’s forum.