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So is Reaper not stretching and processing the audio pieces as well as BIAB does it??

Reaper uses the same Elastique engine, so I would expect that overall the quality is as good as Band-in-a-Box. However, there are various settings and other factors. For example, there are lower quality settings that require less CPU power. I found that the OP's project (to clarify, a project-specific setting) was set to Elastique 3 "Soloist" and when I changed it to Elastique 3 "Pro", that fixed most of the distortion I was hearing. It's possible that the Soloist setting has a specific use case - maybe only monophonic material. It would make sense that it didn't do well with those strumming guitar tracks.


Andrew
PG Music Inc.