Qemu still befuddles me at times. It doesn't help when various command line options are deprecated and changes. For qemu-3.xx, there have been some changes to setting up USB passthrough. This all all came to a head when I needed to restore an iphone. The powermac G5 is dismantled at the moment, so I thought, why not use the Windows 10 VM? After letting Win10 grind along updating itself (I don't fire it up very often), I installed itunes (win10 has an "app store"? ugh.), the fun began....