A couple more points... the match between voice and instrument pitch for the WAL region is well documented by Moyle et. al. There's also stuff Darryl Digarrnga has said about how instrument pitch is related to particular songs... for lively songs with vigorous dancing, higher keys are preferred. More subdued songs utilise lower keys. I think some of that is mentioned in my YouTube clips.
In terms of pitch, D is about as low as I would recommend for a
mago, any lower than that and it starts to resemble generic didgeridoos with little if any
mago sound characteristics. Occasionally you might come across something lower than a D that is outstanding, but these are the exception rather than the rule. I prefer higher keyed
mago myself: Fs, F#s, Gs and G#s. Something with a bit of grunt! That snarly howl sound is what I like
Guan
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