Audio export trouble with sped up clips

This is primarily and audio / export question. I've edited one source file (that happens to be 4K pro res) into two kinds of clips in one sequence. part of the file is essentially unaltered and runs at 100% speed. the other part of the file I have sped up to 3000% speed. when playing back within premier pro, I hear the audio from clips at both speeds. I want to preserve the 'sped-up' sound of the 3000% speed clips. BUT, when I export (using any compression or settings — I've tried many) the final video has NO sound accompanying to the sped up sections, though the 100% sections do have accompanying sound. I've done some troubleshooting and found that clips sped up between 3000 - 1200% have no sound when exported, while clips sped up to 1000% or slower DO have sound when exported. Can you help me preserve the 3000% speed sound in export?
THANKS

I have seen similar and my work around was to send the audio to Audition, do the time change, save and then import back into Premiere.

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Audio export trouble with sped up clips

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