When I hear a PSY-S song, I look forward to two things usually: CHAKA's high and beautifully resonating voice and Masaya Matsuura's（松浦雅也）synthesizer hooks.
I still get those with "Separate Blue", a track from the duo's 6th album "Signal" released in July 1990. With Matsuura, I get those "thrip, thrip, thrip..." notes from his synth (your onomatopoeia mileage may vary) while CHAKA gives out those plaintive and penetrating vocals. "Separate Blue", along with that ever-present jangly beat, also has some added warmth thanks to a brief interlude in the song which sounds like the melody dropped in at an old-fashioned toy shop in Germany or elsewhere in Europe. It's these little turns in new directions that made PSY-S stand out as a technopop band.
In April 1994, PSY-S released "Home Made", an album of self-covers and they performed a quieter and unplugged take on "Separate Blue". Next to Matsuura's melody, Norie Kanzawa（神沢礼江）provided the lyrics.