I solved it myself! Hahaaaa I'm so happy.
It's 'Latin in Dub Major' by Morphosis (1992)!
I googled the bits of pieces of lyrics, stumbled upon an archived site with a copy of Smash Hits from 1981.
(True.) There I found the lyrics to the soft voice part, and the name of that song. That was enough to find the mystery song.
The samples:
The soft solo voice is the beginning of Candidate For Love' by T. S. Monk.
- (Youtube)
The chorus is 'Ye-Le-Me' by Sergio Mendes & Brasil '66
- (Youtube)
No wonder that I couldn't make out the english words in the chorus.
It's in brazilian-portuguese.
I'm celebrating with some salty licorice. <3
- - - -
Okay, so!
1992 breakbeat / hardcore. It samples vocals from a solo female singer + a group:
Audio 1: https://vocaroo.com/1JHwy5z7Kzu6
Audio 2: https://vocaroo.com/13jKN9O4aa9d
(mp3s also attached to the post.)
The vocals are the most identifying part. The singing has strings in the background, so I don't think the source is an acapella.
The audio is from my taping of a show by Touchdown FM in 1992. You'll hear the mystery-song is being mixed in with 'Jungle Muffin' by The Moog, and possibly others, so the audio clips are a mixture of elements from different songs. I do think that the "Hear dis" sample belongs to the song.
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Detective work
I've done research (I'm a good boy) and pitched & slowed down the audio to try to hear the lyrics and identify the source.
For fun (for me, at least), here are slowed down & pitched down versions:
Slow 1 https://vocaroo.com/1TM5iOz6hywP
Slow 2 https://vocaroo.com/1iYC2YogrkCQ
I've googled, Shazam'ed, YouTube'd, and called my aunt, and still haven't found a source, so my lyric-guessing-game is clearly awful, but here they are (in the order of Audio clip 1.) Please trust your ears over mine.
Lyrics
(the group)
"Always come out,
you let it come out,
you let it come out,
we all come out".
(solo, the sweet voice)
"The sun's bursting in,
And tonight some day begins,*1
This time I've got it,
Gonna hide".
(Repeats)
(group, this is the main chorus, the hook)
"Let the […],
[…],
[…],
come to change my heart".*2
(Repeats)
(solo)
"This time I've got it,
Gonna hide".
*1= Could be "And tonight someday begins," or "And the clouds [something]".
*2= Could be "Come to change my heart" / "Come to change my life", or "Come to save my heart" / "Come to save my life", or clearly none of the above as I still haven't found anything.
The audio quality isn't good, sadly. This is from my taping of a show from Touchdown FM in 1992. I live in Iceland so the quality is whatever radio frequencies managed to float across the ocean into my poor antenna. I can't make out all the dj names, but shout out to Dj Chips, who I think I heard somewhere in the recording.
Thank you!
Both for reading this far, and tuning your heart into this quest