One of Minesweeper Suite’s most difficult mixes was the first one. It sounds relaxed; the mix is so subtle not everybody notices it. The CD begins with Mahmoud Fadl’s Nubian drumming and airy vocals, which slowly morph into a dub-hop tune by J-Boogie. When I beat-matched the records — adjusted their playback speed until the tempos matched and blended seamlessly — they also became perfectly pitched to each other. A Holy Grail of DJing: the mixtape blend where different tunes actually harmonize. It sounded great. But the problem lay in the beats: Fadl’s human drumming versus the computer-precise regularity of J-Boogie’s mellow backbeats.