Blue lines through audio, NOT sampling rate

Hello,
A friend is editing some audio, using a lot of tracks (around twenty) and shifting the speed. For some reason audio clips that were slowed to 80 percent are appearing with a blue line through them and playing at a very low volume. I checked the sampling rate and it's 48kHz. Also frustrating is that these playback issues are intermittent.
Any suggestions would be great.
thanks,
jesse

He probably doesn't have the CPU horsepower to render twenty audio tracks on the fly. In User Preferences, you can do a few things to reduce the need to render audio:
a: increase the number of tracks for 'Realtime Playback' - the default is 8 I think, and it can usually handle more;
b. reduce the audio quality to low - it really doesn't sound bad at all, and it only affects your preview audio;

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