pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7728-1779_Thompson.ps) >>/Users/jc/w/tmp/Tune-7728-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/1779_Thompson.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-7728-1779_Thompson.abc 21921 ABC music file with the extracted tune(s)
Tune-7728-1779_Thompson.ps 125011 PostScript
Tune-7728-1779_Thompson.txt 21921 Plain-text file with the extracted tune(s)
Tune-7728-get.log 17124 Log file, useful mostly for debugging
These files should be available for 24 hours.