Change FPS without getting audio out of sync.

Hi there folks,

this should be an easy one, yet I can't seem to figure it out myself. I'm working with Avidemux 2.6.4 and I'm trying to change FPS to make the video faster. But, after that, the audio gets out of sync and I haven't found an option to speed up the audio as well. If I could pin the audio to the video track to they'd get sped up simultaneously , but how.. Thanks for help,

James