I can't set the audio in virtualbox because the GUI is greyed-out; the "Intel HD Audio" listed (but grey) is the wrong device (built-in audio which is disabled in BIOS - ?), it should be an old SoundBlaster.
Everything worked fine in Mint 18.2 (also w/o pulse). Audio works fine in Mint and also in wine applications.
virtualbox Version 5.1.20 r114628 (Qt5.5.1)
I tried the newer version from Oracle (5.2.?) , it wouldn't start with my saved Win7 "guest", complaining about "HDA" (audio).
I get no error messages running from a terminal.
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$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Live [SB Live! 5.1], device 0: emu10k1 [ADC Capture/Standard PCM Playback]
Subdevices: 32/32
....
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$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
default:CARD=Live
SB Live! 5.1, ADC Capture/Standard PCM Playback
Default Audio Device
...
When trying to create a new "machine" I get
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No audio devices could be opened. Selecting the NULL audio backend with the consequence that no sound is audible.
Error ID: HostAudioNotResponding
Severity: Warning
Picture is from trying to start existing machine, not create new one ...