Composer's notes: “Once I received the commission by HD duo to compose a piece for sax and piano, I asked Michael Duke to select for me his favourite multiphonics for alto sax and send me a recording of them. I analysed the spectra of these recordings, establishing the eight dominant partials for each one. I used these chords as the basic materials for the piece; this is why the work is called Spectrax. I then jammed over these chords in order to extract musical ideas, which I transcribed to the...