Agreed with the choice of 3:1 as default. Must admit strathpeys can sound comical in 2:1.

I'll do that with the wording.

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Files produced by the converter last a minimum of 15 minutes. The converter itself has a "tidy up" routine. I guess these days, I could use a cron job but that wasn't an option when we first had the converter and this way works for me.