Roger wrote:

I am carrying out some research work into the viability of automatic
conversion of audio (various formats) into a range of codecs.

You mean "range of formats". A codec is a module (software or hardware)
that converts to and from a specific format.

It needs to be able to produce professional quality conversions using
a range of (user definied) sampling rates.

Have you looked at sox? http://sox.sourceforge.net/

It uses three different algorithms for smaple rate conversion, discussed
he http://leute.server.de/wilde/resample.html

I have been searching online for a while but there's a high signal to
noise ratio when looking for this info on the web.

You mean *low* signal to noise ratio.

--
Mark.
http://tranchant.plus.com/