IDEAS: audio crackling fixes and simultaneous spice client connections

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@@ -122,3 +122,29 @@
     kvmx ssh $guest sudo resize2fs /dev/vda2
     kvmx ssh $guest sudo touch /forcefsck
     kvmx ssh $guest sudo poweroff
+
+## Audio fixes to avoid crackling on input
+
+Implement an option to reduce crackling on sound input.
+
+See:
+
+* https://stackoverflow.com/questions/32193050/qemu-pulseaudio-and-bad-quality-of-sound#35998501
+* https://www.reddit.com/r/VFIO/comments/542bw1/ha_got_rid_of_the_pulse_audio_crackling/
+* https://www.reddit.com/r/VFIO/comments/ibmjs3/finally_fixed_crackling_audio_when_passing/
+* https://www.reddit.com/r/VFIO/comments/746t4h/getting_rid_of_audio_crackling_once_and_for_all/
+* https://www.reddit.com/r/VFIO/comments/8aqju8/audio_crackling_when_routing_output_to_pulseaudio/
+
+Fix:
+
+    export QEMU_AUDIO_DRV="pa"
+    export QEMU_PA_SAMPLES="8192"
+    export QEMU_AUDIO_TIMER_PERIOD="99"
+
+## Simultaneous clients connections
+
+Implement the following:
+
+    export SPICE_DEBUG_ALLOW_MC=1
+
+For explanation, check https://www.spice-space.org/multiple-clients.html