Set the number of CPU’s to 1 in Settings/System/Processor.
Set the Execution Cap to 100% in Settings/System/Processor.
Set the Paravirtualization Interface to Minimal in Settings/System/Acceleration.
Set the Host Audio Driver to PulseAudio in Settings/Audio.
Set the Audio Controller to Intel HD Audio in Settings/Audio.
When your VM is up,
1) set the priority of the audio producing program to ‘Above normal’
2.a) set bass boost level to None
2.b) set loudness equalization release time to short
Control Panel \_ Sound \_ Speakers \_ Properties \_ Enhancements \_ Bass Boost \_ Settings \_ Boost Level = None OK \_ Loudness Equalization \_ Settings \_ Release Time = Short OK OK OK