pitch-transpose

[o_e]

Hi,

 

I'am having hard times to understand what is pitch-transpose doing, please have a look, thanks!

(pitch-transpose -12 '((fs1) (f1) (g-1g1bb2e6gs6a6bb6) (gs-1bb1bb2e6gs6a6bb6) (bb-1cs2bb2a3e6gs6a6bb6cs7)))
               ;==>   ((fs1) (f1) (g1 g1bb1e5gs5a5bb5) (gs1 bb0bb1e5gs5a5bb5) (bb0 cs1bb1a2e5gs5a5bb5cs6))
               ;        x?    x?      x?                                                              
(pitch-transpose  12 '((fs1) (f1) (g-1g1bb2e6gs6a6bb6) (gs-1bb1bb2e6gs6a6bb6) (bb-1cs2bb2a3e6gs6a6bb6cs7)))
               ;==>   ((fs2) (f2) (g1 g2bb3e7gs7a7bb7) (gs1 bb2bb3e7gs7a7bb7) (bb0 cs3bb3a4e7gs7a7bb7cs7))
               ;                                                                                     x?

 

[opmo]

(pitch-transpose -24 '(g-1)) ; out of range
=> (g1)
(pitch-transpose 24 '(c8)) ; out of range
=> (c8)