pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1844-MrsMacPhersonOfInveran1.ps) >>/Users/jc/w/tmp/Tune-1844-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/MrsMacPhersonOfInveran1.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_18441.log 281521 Log file, useful mostly for debugging
Coll_18446.log 284330 Log file, useful mostly for debugging
Coll_18447.log 289950 Log file, useful mostly for debugging
Coll_18449.log 285735 Log file, useful mostly for debugging
Tune-1844-MrsMacPhersonOfInveran1.abc 2754 ABC music file with the extracted tune(s)
Tune-1844-MrsMacPhersonOfInveran1.ps 53211 PostScript
Tune-1844-MrsMacPhersonOfInveran1.txt 2754 Plain-text file with the extracted tune(s)
Tune-1844-get.log 5229 Log file, useful mostly for debugging
These files should be available for 24 hours.