How to preview audio in real time in the canvas/timeline

Hello there, I am new to Apple and FCP (though am an experienced Avid editor) and I have managed to get acquainted on many things already but the following is driving me nuts:
Whenever I try to play most audio clips (sfx or music in mp3/m4a/caf format) in the timeline I get a beeping warning sound as if it was unrendered. This happens even when only playing 2 tracks of audio and nothing else. the same clip plays absolutely fine in the viewer but not in the timeline/canvas. The only clip I have tried that I don't have this issue with is the sample audio clip downloadable from the FCP help menu.
I have made some research and believe this is due to sample rate of the source material which is not compatible with that of the sequence. In this forum someone has advised to convert all audio files to 48Khz/16bit sample rate to make things easier. Does anyone know how I can do this and/or offer general advice on this issue?
Many thanks, Emi Polito.

The list of audio files that FCP can work with is in the manual.... MP3, m4a's etc aren't supported. You need to transfer them to Aif's or WAV files. MP3 and M4a files are delivery formats, not editing formats. Transfering them in QuickTime or iTunes or even FCP or compressor all work to do this. But it has to be done in order for FCP to work with them.
Jerry

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