Jarno Opmeer dropped a video around Monaco in the Mercedes today (110% AI Last to First Challenge).
https://youtu.be/Jt-wI9IXHXc
Still not 100% accurate unfortunately, but it improved a lot nonetheless and deserves proper credit for the improvement.
Now we can at least "somewhat" hear the unique Mercedes Turbo Whistle in low revs (around 4k - 8k rpm).
Listen from 10:15 onwards, to get a better experience of it.
Though from a closer analysis, it must be mentioned that in real life official FOM onboard footages, the unique Mercedes Turbo Whistle can already be heard in higher rpms (9k -10k rpm) too, when simply going off throttle and also on each individual downshift. Also the unique Mercedes Turbo Whistle in low revs, medium revs, off throttle sections & downshifts, should actually be a little bit more pronounced and louder as well, to make it much closer to real life onboards.
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Here is a lap of Hamilton around Australia and Vettel around Canada, notice how the unique Mercedes Turbo Whistle is audible at around 9k to 10k rpm, and on the off throttle section or each individual downshifts?
https://youtu.be/blxV8_0phjI
https://youtu.be/cX2sw-9TZdo
If Codemasters, with Mr. Porter @issueskid13 as one of the lead devs on Audio, can also correctly implement this into the Mercedes Engine Sound Bundle, then it will be greatly improved and make it even more close to real life FOM onboard footages!!!