Thanks to Isidora Mikhailovich, whose Facebook post took me down memory lane. P16.D4 were the project of Ralf Wehowski, who would go on to record as RLW. S. B. O. T. H. I. was the project of Achim Wollscheid. Both were composers based in Germany working with extreme experimental music. Most of what I had from these artists was on cassette tapes. I pine for those days on occasion.