Review: When it comes to exploring the full potential of Roland's iconic TB-303 bass synthesizer, few are quite as capable of I Love Acid and Balkan Vinyl chiefs Posthuman. Here the long-serving duo pops up on X-Kalay with a particularly robust and club-friendly three-tracker. For straight-up heaviness you can't beat "King Rat", a muscular and sweaty fusion of booming beats, clanking drum fills, outer-space effects and energy-packed acid lines. Arguably more exciting, though, is A-side "Airwave Uranium", an acid-electro bubbler rich in psychedelic TB-303 lines, moody chords and bleeping electronics. X-Kalay artist Lou Karsh provides the accompanying remix, giddily emphasizing Posthuman's razor-sharp acid lines while subtly beefing up the beats.