Got to bump up this topic. During years Reinhold Friedl as well as Zeitkratzer has published A LOT of material. Some great, some not so great. Recently listened box set of 3 CD's including: Zeitkratzer & Carsten Nicolai, Zeitkratzer & Terre Thaemlitz, Zeitkratzer & Keiji Haino. At best, simply brilliant. Eerie droning acoustic instruments. At worst, pretty shitty. Including quite ordinary music. Another Zeitkratzer & Keiji Haino CD, not that good either. But I remain to be interested in what project does.
Recent purchase was Reinhold Friedl / Dirk Dresselhaus "Real Time" 3xCD box. Friedl is using mostly piano and some other object. Metal plate, horse hair, fishing line, metal tube... While Dresselhaus uses oscillators, delay, reverb, noisegenerators etc. I guess name tells it all. This is drone sessions in real time. I guess no edits and much post production, but duo playing together very nice droning material. Sound is clear, sharp and probably happens in room what is recorded. Long tracks with slowly shifting sounds. Friedl's physical treatment of piano strings combined with oscillating electronics constantly modulated with delays and spring reverbs. Despite rather minimalistic, still always on the move, and hands-on -approach to making the sounds. Good box, despite not fan of mere solid red color box with no artwork/graphics, beyond having info text inside otherwise blank box.