So I modify the tempo of all the tracks by adjusting or typing in a higher rate on the slider. That seems fine for playing back. problem is exporting or rendering. The exported file does not make the rate adjustment. The export plays back at the old speed. Clues?
Shuttle playback speed settings are only for real-time playback, they never get rendered. They are transport tools, not compositional or editing tools.
I must say, I've always wished you could somehow "automate" this tool and have it print to a track that way. I always get nice effects with this and want to record it easily.
While this will work for some hardware, it is generally not.
I will also point out that the rate control is a lower quality resample. It is intended for scrubbing or shuttling the transport. It is NOT meant to produce release quality resampling.