I can see I'm confusing you all........
What I mean is that I will be playing in the key of C, mentally, but the tune will be played in the key of the whistle.
If I use a key of A whistle, where the notation shows a C note, I will finger it as a C note on a key of C whistle, but it will actually be played as an A note, key of A.
Likewise, if I use a key of D whistle, & I play a C note, mentally, but the whistle actually plays a D note - transposing from C to D, etc.
If I try to play in the key of the whistles, I would have to transpose for each different key, therefore I intend to play them as if they were all C instruments.
(Kind of like playing whistle tab on a different keyed whistle.)
updated by @keith: 12/10/18 10:43:24AM