[SDL] OT: How do you transpose the pitch of a WAV/sample?

[Kenneth Bull]

On 5 May 2011 14:25, SparkyNZ <pj74 at xtra.co.nz> wrote:
> Suppose I have a buffer of samples that fits an instrument recorded playing
> note C (e.g 523.25Hz) .. How would I transpose that sound up to D?
> (587.33Hz)

You're looking for pitch shifting.  Try google.

This looks promising:
http://www.dspdimension.com/admin/time-pitch-overview/