libvirt Windows 10 optimal settings, no microphone cracking

libvirt-win10.xml

<!-- IMPORTANT: before you try this, change in system:

/etc/pulse/daemon.conf:
default-sample-rate = 44100
alternate-sample-rate = 48000

/etc/libvirt/qemu.conf:
user = "ernie"

Then restart pulseaudio & libvirt or reboot.

-->
<domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0" type="kvm">
<!-- IMPORTANT LINE ABOVE -->
  <name>win10</name>
  <uuid>2aea9dcd-4265-4d1e-a336-68e53502dfd0</uuid>
  <metadata>
    <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
      <libosinfo:os id="http://microsoft.com/win/10"/>
    </libosinfo:libosinfo>
  </metadata>
  <memory unit="KiB">5120000</memory>
  <currentMemory unit="KiB">4096000</currentMemory>
  <vcpu placement="static">8</vcpu>
  <os>
    <type arch="x86_64" machine="pc-i440fx-4.2">hvm</type>
    <!-- IMPORTANT LINE ABOVE -->
    <boot dev="hd"/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <hyperv>
      <relaxed state="on"/>
      <vapic state="on"/>
      <spinlocks state="on" retries="8191"/>
      <vpindex state="on"/>
      <runtime state="on"/>
      <synic state="on"/>
      <stimer state="on">
        <direct state="on"/>
      </stimer>
      <reset state="on"/>
      <vendor_id state="on" value="KVM Hv"/>
      <frequencies state="on"/>
      <reenlightenment state="on"/>
      <tlbflush state="on"/>
    </hyperv>
    <!-- IMPORTANT: whole hyperv section is important -->
    <vmport state="off"/>
  </features>
  <cpu mode="host-model" check="partial"/>
  <clock offset="localtime">
    <timer name="rtc" tickpolicy="catchup"/>
    <timer name="pit" tickpolicy="delay"/>
    <timer name="hpet" present="no"/>
    <timer name="hypervclock" present="yes"/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <pm>
    <suspend-to-mem enabled="no"/>
    <suspend-to-disk enabled="no"/>
  </pm>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type="file" device="disk">
      <driver name="qemu" type="qcow2" cache="writeback"/>
      <source file="/media/fast-data/virtual/kvm/win10_2017.qcow2"/>
      <target dev="vda" bus="virtio"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x08" function="0x0"/>
    </disk>
    <disk type="file" device="floppy">
      <driver name="qemu" type="qcow2"/>
      <source file="/home/ernie/.Virtual/kvm/delme-floppy-test.qcow2"/>
      <target dev="fda" bus="fdc"/>
      <address type="drive" controller="0" bus="0" target="0" unit="0"/>
    </disk>
    <controller type="usb" index="0" model="ich9-ehci1">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x7"/>
    </controller>
    <controller type="usb" index="0" model="ich9-uhci1">
      <master startport="0"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x0" multifunction="on"/>
    </controller>
    <controller type="usb" index="0" model="ich9-uhci2">
      <master startport="2"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x1"/>
    </controller>
    <controller type="usb" index="0" model="ich9-uhci3">
      <master startport="4"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x2"/>
    </controller>
    <controller type="pci" index="0" model="pci-root"/>
    <controller type="ide" index="0">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x1"/>
    </controller>
    <controller type="virtio-serial" index="0">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x06" function="0x0"/>
    </controller>
    <controller type="fdc" index="0"/>
    <interface type="bridge">
      <mac address="52:54:00:c7:f0:77"/>
      <source bridge="br0"/>
      <model type="virtio"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0"/>
    </interface>
    <serial type="pty">
      <target type="isa-serial" port="0">
        <model name="isa-serial"/>
      </target>
    </serial>
    <console type="pty">
      <target type="serial" port="0"/>
    </console>
    <channel type="spicevmc">
      <target type="virtio" name="com.redhat.spice.0"/>
      <address type="virtio-serial" controller="0" bus="0" port="1"/>
    </channel>
    <input type="tablet" bus="usb">
      <address type="usb" bus="0" port="1"/>
    </input>
    <input type="mouse" bus="ps2"/>
    <input type="keyboard" bus="ps2"/>
    <graphics type="spice">
      <listen type="none"/>
      <image compression="off"/>
      <gl enable="no" rendernode="/dev/dri/by-path/pci-0000:29:00.0-render"/>
    </graphics>
    <sound model="ich6">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x04" function="0x0"/>
    </sound>
    <video>
      <model type="qxl" ram="65536" vram="65536" vgamem="16384" heads="1" primary="yes"/>
      <address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0"/>
    </video>
    <redirdev bus="usb" type="spicevmc">
      <address type="usb" bus="0" port="2"/>
    </redirdev>
    <redirdev bus="usb" type="spicevmc">
      <address type="usb" bus="0" port="3"/>
    </redirdev>
    <memballoon model="virtio">
      <address type="pci" domain="0x0000" bus="0x00" slot="0x07" function="0x0"/>
    </memballoon>
  </devices>
  <qemu:commandline>
    <qemu:arg value="-device"/>
    <qemu:arg value="ich9-intel-hda,bus=pci.0,addr=0x1b"/>
    <qemu:arg value="-device"/>
    <qemu:arg value="hda-output,audiodev=snd0"/>
    <qemu:arg value="-audiodev"/>
    <qemu:arg value="pa,id=snd0,out.frequency=48000,server=unix:/run/user/1000/pulse/native"/>
  </qemu:commandline>
  <!-- IMPORTANT: whole commandline section is important -->
</domain>