Since its inception, John Tejada’s Palette label has focused primarily on techno but over recent years has concentrated on the tracky form of the genre. His own work has veered towards that same path at times, with several releases that bore more than a passing resemblance to new school minimal. But 2009 has seen a return to the form of old. This year’s earlier release by Tejada, “Fractals,” affirmed an interest in re-exploring overtly melodic themes with nods to early UK techno and even a jungle reference peaking its head through the techno rhythms. Tejada’s latest, “Vertex,” finds him reaching for a similar trajectory while also keeping the dance floor in his sights.