I once owned a copy of this interesting CD:
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Dizzy Divinity I (Turin 1985) for flute alone
Byzantine Prayer (1988) for 40 flutists with 72 flutes
Frenetico Il Longing Di Amare (1984/87) for bass voice, octobass or double-bass flute and sound icon
Capricorn's Nostalgic Crickets II (1980)
I recall having high hopes for the "flute orchestra" piece
Byzantine Prayer, but I don't believe the recording was able to capture what it must sound like live.
I think Mandryka's posted elsewhere on Radulescu's
Inner Time and
Inner Time II (solo clarinet and 7 clarinets resp.).