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Software to loop and change tempo
(slrpnk.net)
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In terms of what OP wants to use it for, it's free in all but name. Even after evaluation you only need to say "thanks I'll buy it later" and the popup goes away, all features still work.
It's that friendly approach and incredible price that got me to fully purchase it and buy into the ecosystem I'd then been long acquainted with. Would highly recommend Reaper. Agreed on the light amount of default plugins, but again for such a small, specific use case it should be more than fine