The Sound Migration label takes another trip back in to the CATT articles to explore the proto-trance and early bleep techno sound they were pushing from 1988-1991. Another five essential gems from the modestly sized catalogue get an airing here, kicking off with Confidential's haunting 'Amphibious Carbine' followed by the boxy pressure of Exocet's 'Nitrogen'. This is astounding stuff throughout, not least the freak-zone trip of Holy Ghost's 'Walking On Air', which sounds like the common denominator between Ibiza and Goa in their nascent days as party destinations. Don't sleep on the clattering funk of Exocet's 'Overdose' either, a seriously snappy groover with all kinds of oddball sampling going on.