I think this release will be of interest primarily to recorder specialists, and perhaps especially ones who enjoy the instruments themselves as opposed to music for the recorder. Mr Stempfel makes recorders, and this release was born when Jonas Niederstadt, a producer he was working with on another program, suggested that he make a solo recording using the instruments he had made to “bring forth all facets of the sound of the flute as you imagine it!”
A different recorder is used for almost every piece on this program, and it is indeed a study in sound. But it’s not the sort of thing you put on in the background for not-very attentive listening; try that, and you’ll probably find it annoying. The playing and sound are both excellent, but this is a special treat for people who love and are interested in recorders rather than for the average listener.