I have voiceover audio that needs to be synced in Flash and it is causing sound quality issues. It has a tingy metalic sound to it most likely due to the compression by Flash. It is similar to a poor quality mp3.

What are you guys doing in order to minimise this?

Is there an approach or method that you do to minimize this issue occuring? eg. use mp3, use best quality, eq the voice to minimise issues, etc.

The audio must be streamed. So far I have tried using wav files, using high quality when publishing, etc. and I am running out of ideas.

Does anyone know what usually causes this? Is it because of a certain voice, frequency, original format used, etc?