I'd assume that once you'd set up a project with a particular sample rate Logic won't then
allow you to change the sample rate- for that project- later. Try either setting up a new
project- and set the sample rate before you do anything else (don't record anything
beforehand, for sure) and then saving the 'blank' project (and maybe re-opening to check
it's kept the sample rate) and/or saving the project as a template, and then selecting
that template when setting up any further new projects.
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