That PS1-era vocal production on "Yume no Tsubasa" hits with this specific late-90s warmth that digital recording just doesn't replicate. The Yumeno Tsubasa Sound Collection mixes vocal tracks with their synth-only counterparts, and the contrast between versions tells you everything about how arrangements carry emotion.
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"At the base of night sky" has this contemplative stillness with that characteristic PlayStation reverb. "Longing for AIR" builds slowly into something genuinely aching, and hearing the synth version afterward is like seeing the skeleton of a feeling.
The instrumental and synthe versions aren't filler either, they reveal how much the compositions stand on their own. If you collect turn-of-the-millennium PS1 vocal soundtracks, this one has that exact analog-to-digital transitional sound.