pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-38922-191_the_Little_Assembly.ps) >>/Users/jc/w/tmp/Tune-38922-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/WilliamCampbell/10thBook/191_the_Little_Assembly.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-38922-191_the_Little_Assembly.abc 1189 ABC music file with the extracted tune(s)
Tune-38922-191_the_Little_Assembly.ps 36573 PostScript
Tune-38922-191_the_Little_Assembly.txt 1189 Plain-text file with the extracted tune(s)
Tune-38922-get.log 22343 Log file, useful mostly for debugging
These files should be available for 24 hours.