Make transposed tunes use the original audio. The aim of MIDI and MP3 is to allow the user to hear what a tune sounds like. For transposed bookes, I think this should be reused from the main booke page, because hearing it at the transposed pitch isn't a major help. And in fact given the way cello transposition is done, the sound won't be transposed anyway. And Jane hasn't complained. This will speed up building the bookes by removing audio generation, the slowest process, from the transposed bookes.

X:1
T:Three Around Three
S:Nick Barber
M:4/4
L:1/8
Z:Steve Mansfield 2002
K:G
"G" d2BA G2G2 | "D" A2BA "G" G2D2 | "C" EDEF "G" G2AB | "D" c2B2 B2A2 |
"G" d2BA G2G2 | "D" A2BA "G" G2D2 | "C" EDEF "G" G2Ac | "G" BG "D" AF "G" G4 :|
|: "D" d2 ef "G" gfed | "C" e2e2 e2>e2 | "G" d2B2B2AG | "D" FGAB A4 |
   "D" d2ef "G" gfed | "C" e2e2e2d2 | "C" ef g2 "D" fgaf | "G" g2 b2 g4 :|