pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-12843-Peter_Milne.ps) >>/Users/jc/w/tmp/Tune-12843-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/by/Peter_Milne.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_12843.log 381275 Log file, useful mostly for debugging
Tune-12843-Peter_Milne.abc 7512 ABC music file with the extracted tune(s)
Tune-12843-Peter_Milne.ps 137089 PostScript
Tune-12843-Peter_Milne.txt 7512 Plain-text file with the extracted tune(s)
Tune-12843-get.log 18071 Log file, useful mostly for debugging
These files should be available for 24 hours.