Thats brilliant, thanks so much! Compressor worked.
I set the duration to 150% of source and this looks about right – hard to get my head around this as I’m used to reducing the percentage in fcp in order to slow it down, not increasing it. Any idea what the correct percentage is for making stuff shot at 18fps but scanned at 24fps play at natural speed? Tried to search online for an answer but I can’t find it.