pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-17483-20_TheLastOfTwenty.ps) >>/Users/jc/w/tmp/Tune-17483-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ThomasBraysCountryDances1699/20_TheLastOfTwenty.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-17483-20_TheLastOfTwenty.abc 2716 ABC music file with the extracted tune(s)
Tune-17483-20_TheLastOfTwenty.ps 41020 PostScript
Tune-17483-20_TheLastOfTwenty.txt 2716 Plain-text file with the extracted tune(s)
Tune-17483-get.log 4816 Log file, useful mostly for debugging
These files should be available for 24 hours.