Please add findings/research to report here:
https://mametesters.org/view.php?id=443
Bug report has been opened for over a dozen years, since 2008 with last note update from 2018.
Seems the issue has been around since the get-go; however, there is also varying results with the Arcade PCBs as well.
The Aug 13, 2009 update from couriersud covers this point:
"Mike Coates was so kind to grant permission to cite him here:
---- citation ----
I've had in excess of 50 galaxian / moon cresta boards, bootlegs and originals - for quite a lot of the sound circuitry (and the video mixing and colours) they used whatever resistors / capacitors / transistors they had handy - sound varies from board to board quite considerably - even if the boards are originals from the same manufacturer.
---- citation ----
This perfectly explains the difficulties in discrete sound emulation. Even if you have high quality recordings at hand there is still uncertainty whether they fit the schematics available."
What may be ideal is a way to tweak the background sound pace (and pitch?) within the game with adjustable setting(s) via the menu options, similar to the analog sensitivity adjustment for controllers but regarding the respective analog sound components involved.
That is up to MAMEDev prerogative and resource available, of course. 
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Re: Galaxian background sound (hum) not quite right.
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