Require help in generating sine waves for HE-AAC Format

Hi,

We are struck up with generating sine waves for HE-AAC format.
We have tried using tools like Audacity, Gold Wave, Lame Encoder, FFMpeg, Fraunhoffer etc and several forums available over web. Could not still get a break through.

Any help is highly appreciated.

Thanks,
Chandra Mouli

iTunes supports encoding / decoding HE-AAC.