Undulate, the solo release from Niklas Adam, a sound artist originally from Denmark but now living in Oslo, is a paradoxical album. The two longish tracks are austere and episodic in structure, but the individual sounds that they comprise are strangely sensual. Both pieces consist of more or less discrete events of sounds whose sources are hard to place—acoustic percussion? Purely electronic sounds? Some combination of the two or something else altogether?—but which call attention to themselves in a quiet but compelling way.