i have an MXF clip on my timeline and it has waveforms but when I press the proxy button the waveforms go away and that clip doesnt play audio any more. why is that? i think the format of proxy i chose was quicktime prores medium resolution. you can see i have 2 clips stacked on top of each other. i think both have the same format of proxy. but the audio isnt disappearing for both clips. only one clip. the audio shouldnt be disappearing at all when I turn on the proxy button. Meta data for the clip with disappearing audio says the camera type is Sony PXW-FX9V. video codec avci.