To me the rover driving sound is pretty weird. It feels too loud an becomes rather annoying after a short while.
If an electric vehicle makes a humanly audible sound at all I'd expect it to sound similar to the sound in this video.
This video gives another example (which might be useful as inspiration for the sound design). However with the rover accelerating much slower than a F1 car this sound would be too aggressive and loud.
I am aware that mars's atmosphere is thinner than earth's and has a different composition. This would probably cause sounds to become lower pitched on mars. Since we are wearing a pressurized suit I'd expect the helmet to filter high pitched noises from the electric motors rather well. However I'd expect to hear dull, muffled noises caused by driving over smal rocks or uneven terrain.
Suggestions for improvement:
- Change the electric motor sound based on the samples above but make it rather quiet
- Use the electric motor sound in the acceleration phase but (almost) mute it when having reached travel speed (like in the 1st video)
- When moving with travelspeed dull muffled sounds caused by the terrain should be audible
The following video could be a good reference point for the terrain sound while driving (minus the occasional cracking underwood and humming sound on the right channel). Of course it would need to be damped because of the thinner atmosphere and sound damping caused by the EVA suit:
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