Having previously befuddled dubstep purists with releases on Mala's Deep Medi Musik, Old Apparatus are now striking out on their own with their freshly minted and aptly titled Sullen Tone imprint. There's rarely much joviality to be found in the murky underbelly of electronic 'composition Old Apparatus inhabit, and this 4 track Derren EP is their strongest artistic statement yet. There are moments on Derren where you can hear discernible links to the UK bass world that Old Apparatus seem have slid out from under. "Dealow" has a tribal-industrial rattle that captures the finest dread-fuelled DMZ workouts, falling around the 140 bpm mark without making it too obvious. What makes this EP so engrossing is the deft crossover between organic and electronic - it's nigh on impossible to tell where the found sound ends and the synthesised tone begins. There's also a staggering dynamism to these tracks; they rarely sit still on the same idea for long before turning down another darkened corner where the walls crawl with forlorn drones and wraith-like percussion hovers in and around you.