This is possibly made by analog recording to magnetic tape.
The following signal path was tried:
On recording:
Male singing voice - AKG MI 201-100 mic - Uher 4200 (1st bought on eBay) at 7.5ips, various rec modulation levels - BASF SM911 tape
On playback:
BASF SM911 - Uher 4200 (2nd bought on eBay), listening from its loudspeaker
While recoding various a Capella vocal takes of a demo song (Πως Θα Ηταν), the rec level knob was continuously increased after each take. The tape was driven more and more. Up to VU needle almost always after 0VU.
The hotter the tape was driven the more in front and out of the speaker the vocal sounds. It is not just louder, it sounds as nearer to listener's face.
A possible explanation is gentle rounding of peaks while average signal level is increased?
A nice thing about analog recording is that at playback the signal is integrated or high cut to get back to flat frequency response. So are heavily chopped peaks rounded off too?
Other reasons for a vocal jumping out (in front) at you may be the corect use of equal loudnes curves. And the fact that less loud singing makes a more loud vocal recording. The ratio of average signal to peaks is increased?
See also interviews of Mike Oldfield on how he created his guitar sound. By treble boost, clipping, then treble cut...?
See also analog Orban Optimod used before FM tadio transmision.
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