The content did mention it did include the sound recording of a 400 (and the 512BB, 308GTB and 308GT4).
Till now I only knew of these series:
https://www.discogs.com/
And as can be seen, that series only does include a recording of a Ferrari 512BB and some other supercars. Also these records are produced in 1977. Just for the fun and out of curiosity I bought one last year.
Supercar Sound Series : Lamborghini Countach
I also made an effort to convert this one to MP3 and published it on YouTube:
Side A: https://youtu.be/
Side B: https://youtu.be/ aRKnKNNWsmY
(If you like this you might find this blog entertaining too:
https://erwinxjs.blogspot.com/2017/09/jaguar-xj-s-total-driving-experience.html)
(If you like this you might find this blog entertaining too:
https://erwinxjs.blogspot.com/2017/09/jaguar-xj-s-total-driving-experience.html)
Also for this record I made an effort to digitize the recording and convert it into MP3 and put it on YouTube. I have to say I can't recognize the 400 sound recording though. Which is strange as it should be a completely different sound compared to the 512 Boxer engine or the V8 engine in the 308.
If one of my readers can translate the Japanese backside for me that would be very much appreciated:
I did some furhter checking regarding this record but was unable to find anything more on the worldwide web. Except for this link: https://www.snowrecords.jp/?pid=101321592 But that does not reveal anything more. They did however produced additional recordings for other supercars (as indicated on the back cover).
Well, in any case you now can listnen to the recording here: