pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1553-PCD1.ps) >>/Users/jc/w/tmp/Tune-1553-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/SkillernChalloner/PCD1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_15534.log 323671 Log file, useful mostly for debugging
Form_15532.log 2137 Log file, useful mostly for debugging
Form_15534.log 958 Log file, useful mostly for debugging
Form_15536.log 984 Log file, useful mostly for debugging
Tune-1553-PCD1.abc 41306 ABC music file with the extracted tune(s)
Tune-1553-PCD1.ps 330086 PostScript
Tune-1553-PCD1.txt 41306 Plain-text file with the extracted tune(s)
Tune-1553-get.log 23332 Log file, useful mostly for debugging
Tune-15534-get.log 3847 Log file, useful mostly for debugging
Tune-15538-get.log 3681 Log file, useful mostly for debugging
These files should be available for 24 hours.