pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-46153-232_the_Breast_Knot.ps) >>/Users/jc/w/tmp/Tune-46153-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/WilliamCampbell/10thBook/232_the_Breast_Knot.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-46153-232_the_Breast_Knot.abc 1078 ABC music file with the extracted tune(s)
Tune-46153-232_the_Breast_Knot.ps 35482 PostScript
Tune-46153-232_the_Breast_Knot.txt 1078 Plain-text file with the extracted tune(s)
Tune-46153-24CountryDances_1802_Thompson.ps 6 PostScript
Tune-46153-get.log 9228 Log file, useful mostly for debugging
These files should be available for 24 hours.