I Know it might be a bit late, but since google brought me here, I thought I would update this with how I do it. To change the speed of a clip at various parts and have the sound change also, is a bit tricky but ill explain it. first go into the time remapping panel and add the start and end keyframes for your part to speed up/slow down. Then alt click the audio to select it ONLY. Use the razorblade tool to cut the audio at both parts where the keyframes are, you will see the lines on the clip to guide you. Then time remap the keyframed section, alt click to select the audio only, and use rate stretch to make the audio match the length of the video. Voila. I used that technique today and it works great and doesn't take too long.
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