I am trying to mount a USB 1 audio interface. At one point I was getting a speed mismatch error. I'm using: -device usb-ehci,id=ehci -device usb-host,bus=ehci.0,vendorid=xxx,productid=xxx (not xxx, actual IDs) This let me to a thread https://chromium.googlesource.com/external/qemu/+/v2.4.0-rc2/docs/...