pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-93538-Just_thought_ont.ps) >>/Users/jc/w/tmp/Tune-93538-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/JohnWalsh/Just_thought_ont.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_93538.log 794 Log file, useful mostly for debugging
Tune-93538-Just_thought_ont.abc 1230 ABC music file with the extracted tune(s)
Tune-93538-Just_thought_ont.ps 37351 PostScript
Tune-93538-Just_thought_ont.txt 1230 Plain-text file with the extracted tune(s)
Tune-93538-get.log 4591 Log file, useful mostly for debugging
These files should be available for 24 hours.