Lame's options are higly customizables, why did you not done the same with AAC?
It's is very important to have the choice to choose these parameters:
- Frequency (AAC supports up to 96kHz) add at least 22.5kHz 24kHz (32kHz) 44.1kHz 48kHz (64kHz) 88.2kHz and 96kHz (and a option