pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-76951-4101-the_Island_of_Mull.ps) >>/Users/jc/w/tmp/Tune-76951-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR12/4101-the_Island_of_Mull.abc1.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-76951-4101-the_Island_of_Mull.abc 1110 ABC music file with the extracted tune(s)
Tune-76951-4101-the_Island_of_Mull.ps 39938 PostScript
Tune-76951-4101-the_Island_of_Mull.txt 1110 Plain-text file with the extracted tune(s)
Tune-76951-get.log 4857 Log file, useful mostly for debugging
These files should be available for 24 hours.