pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1718-Just_Because_2.ps) >>/Users/jc/w/tmp/Tune-1718-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Square/Just_Because_2.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_17184.log 728310 Log file, useful mostly for debugging
Coll_17185.log 410780 Log file, useful mostly for debugging
Tune-1718-Just_Because_2.abc 666 ABC music file with the extracted tune(s)
Tune-1718-Just_Because_2.ps 35199 PostScript
Tune-1718-Just_Because_2.txt 666 Plain-text file with the extracted tune(s)
Tune-1718-get.log 4488 Log file, useful mostly for debugging
Tune-17182-get.log 4677 Log file, useful mostly for debugging
Tune-17183-get.log 10083 Log file, useful mostly for debugging
Tune-17189-get.log 4051 Log file, useful mostly for debugging
These files should be available for 24 hours.