Spéléonaxis is the newest acoustic document by Miguel A. Ruiz and Siegmar Fricke who collaborate since the mid 90s on their project EFFICIENT REFINERIES. Produced again like the former three albums at Pharmakustik’s studio in Germany, the album contains six improvisational studiosession-recordings involving lots of new hardware and plugin-synthesizers. On Spéléonaxis EFFICIENT REFINERIES combines retrocosmic structures similar to the late 60s with innovative glitch-electronics and the newest technical possibilities in sound-processing. In addition very contrary elements are involved, ranging from melodic minimalism to pulsating psychotronics. Spéléonaxis can therefore be characterized as the most accessible and at the same time most experimental E.R. album so far.