I googled for more than an hour now and didnt find anything useful.

Is there a way to generate a sine wave or just a sound of a certain frequency?
What i want to do is, play different notes of the musical scale... sounds with a given volume and frequency. Is there a way to do so?

If not, i figure the second best way would be to load a audio sample with a middle C and then change the frequency of that so that it plays the notes i want.

Thanks for any help =)