In 2016 Moira Usher reviewed two duets in the Recorder Magazine. Swamp Stomp (0riginally written for great & contra bass recorders) and Seven Shades of Blue (treble & tenor). She writes, "David doesn't specify but I assume this is supposed to be played straight (yes), though we did swing it and it worked well both ways. There is scope for improvisation in some sections for both parts, and written on the back cover of the score is a blues scale to help the less experienced. (The piece works without improvisation). The bass part is almost passacaglia-like in that it repeats but is still interesting to play and is allowed away from that at times. A good concert item for advanced players if you understand the genre.
I very much enjoy music with a jazzy / swing feel to it and David is something of a specialist in this area. Seven Shades of Blue is a set of instrumental blues, delightful to play ranging from good to very good. Each piece has a suggested range of speeds. There are interesting and unexpected rhythms, plenty of accidentals - so enough to keep players on their toes. This is a great set for anyone who has a real sense of the genre".