The shows listed on this site were recorded off FM radio to Dolby B cassette tape, for the most part. There were also some reel to reel recordings. Rev. Willis  transferred the tapes to digital at 24 bit, then edited, cleaned and compressed to AAC format (iTunes). The results are very listenable; however there are problems here and there, a few shows are cut off, and some dropouts exist (this is rare). However, overall, this is a great archive of an important radio era in the 1970’s. Give ‘em a listen!