feature request: ability to change/convert sample rate (either in project, or as an export parameter) would be very useful?
If this already exists, someone please tell me?
Thank you so much for this awesome application. 
When exporting, the sample rate is set by the “Project Rate” (lower left corner of the main Audacity interface).
The “Mix and Render” commands also use the “Project Rate”.
The “SetProject:” macro command allows you to change the Project Rate.