I may regret this tread, but... crazy

My experience in Reaper is that changing the time signature "does NOT effect the tempo!" The audio content of a track will sound exactly the same if you change the time signature from 4/4 to 6/8 and play at the exact same tempo.

So I am not saying that Rharv's (and others) math is incorrect. What I am saying is it don't matter. shocked

Why? Because Reaper, like other DAWs, has a fearure for setting the Project Time Base (see pic). So just like using a tempo map, when you have a key signature change it only establishes a "visual grid" which overlays the tracks. If you have the project time base set to "Time", the audio will not change, not stretch and will play exactly the same. This is a very advanced feature and needs the user to read the manual (or find a training video).
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Thats my 2cents. Other than that, I really don't understand why we are all having so much difficulty with this usage. But we are! cry

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6