Blues from the Darkside

If you know Steve Guyger's 'Blues from the Darkside' off his Last Train to Dover album (and I bet it's filed on your Mac somewhere!), I wonder if you could answer a couple of questions about it. Firstly, is it a 16 hole chromatic he's playing? Secondly, he often ends the main lick (a great example of dynamics and repetition) with either tremolo or a flutter, but I can't figure out which - I hear it at 0.36 -0.40 ... been trying to match the sound but I'm not convinced I've got it. Anyway, it's a great slow-burn instrumental and it's going to take me a hell of a long time to figure out the unusual chords and splits he uses.