Hi,

I'd like to add to the previous report that similar issues are present in
OSX (Sierra) builds of qemu-system-ppc.

In Mac OS 9.2 and OS X 10.3 guests, sound through the usb-audio device is
unrecognisable.
After forcibly shutting down Mac OS 9.2 after it becomes unresponsive, qemu
crashes. The OS X crash reporter says this:
Thread 2 Crashed:
0   qemu-system-ppc               0x000000010999c4bd timer_del + 13
(qemu-timer.c:429)
1   qemu-system-ppc               0x00000001096d543f audio_reset_timer +
319 (audio.c:811)
2   qemu-system-ppc               0x00000001096ca2a6 vm_state_notify + 262
(vl.c:1433)
3   qemu-system-ppc               0x000000010953642f do_vm_stop + 47
(cpus.c:1104)
4   qemu-system-ppc               0x00000001096ceed7 qemu_main + 17239
(vl.c:4477)
5   qemu-system-ppc               0x000000010988a526 call_qemu_main + 38
(cocoa.m:1769)
6   qemu-system-ppc               0x00000001099a11ee qemu_thread_start +
126 (qemu-thread-posix.c:519)
7   libsystem_pthread.dylib       0x00007fffb864a93b _pthread_body + 180
8   libsystem_pthread.dylib       0x00007fffb864a887 _pthread_start + 286
9   libsystem_pthread.dylib       0x00007fffb864a08d thread_start + 13

Best,
Howard