pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-20778-P4.ps) >>/Users/jc/w/tmp/Tune-20778-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BostonCollection/P4.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_20778.log 1007 Log file, useful mostly for debugging
Tune-20778-P4.abc 2539 ABC music file with the extracted tune(s)
Tune-20778-P4.ps 36083 PostScript
Tune-20778-P4.txt 2539 Plain-text file with the extracted tune(s)
Tune-20778-get.log 10490 Log file, useful mostly for debugging
These files should be available for 24 hours.