Audio Conversion APIs

Hello,
can any body pls tell me where can i get the APIs for Audio Conversions for different formats. say for e.g.
WAV - MP3
MP3 - WAV
MIDI - MP3
n so on

windows media server sdk can let you do the top 2 i think. don't know about midi to mp3 though.

I did mess around with an ap to convert mp3 to wma, but i never got it working properly it would only ever convert the first few seconds of the file.
Mind you that was probably me just being ****e. the sdk does come with documentation and some examples in .net and vb etc etc

I have used madxlib successfully to convert from MP3 to WAV and MP3 to PCM which was burned to cd with imapi (all in vb.net). It looks like aumplib does even more. Madxlib was quite tricky to use - to get the dll I needed C++ express, and I think I needed to stick a WAV header onto the top of the file. If there is an easier option available then use it!

well thnkx for ur comments guys ... but actually i only mentioned a couple of formats ... i need many more than that.. like MP3,WAV,Midi,OGG all from one to another. I tried to search for a API toolkit is as well but to no avail. Then i tried search for softwares that does wat i want, to ask their salesperson to sell me the APIs they used in their project. If any of u know a software house or party whose willing to do so .. then pls contact me ASAP.

Hello again. i tried to use this madxlib but have no idea how to get it working .. its not compiled, it does not have the required dlls, i did download those dll. but all those dlls n makefiles which i have neva seen before n dunno how to use it. y dun they put there a compiled .dll to make use of. pls help get out of this hassle.

pls compile it in a dll and upload it here
thnkx !