pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18280-3363_Mr_Alexander_Cunninghams.ps) >>/Users/jc/w/tmp/Tune-18280-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CSR/3363_Mr_Alexander_Cunninghams.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_18280.log 277811 Log file, useful mostly for debugging
Tune-18280-3363_Mr_Alexander_Cunninghams.abc 1003 ABC music file with the extracted tune(s)
Tune-18280-3363_Mr_Alexander_Cunninghams.ps 39273 PostScript
Tune-18280-3363_Mr_Alexander_Cunninghams.txt 1003 Plain-text file with the extracted tune(s)
Tune-18280-get.log 5055 Log file, useful mostly for debugging
These files should be available for 24 hours.