pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7040-learnM.ps) >>/Users/jc/w/tmp/Tune-7040-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/Contra/learnM.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_70400.log 770460 Log file, useful mostly for debugging
Coll_70404.log 252015 Log file, useful mostly for debugging
Coll_70405.log 1630000 Log file, useful mostly for debugging
Tune-7040-get.log 12573 Log file, useful mostly for debugging
Tune-7040-learnM.abc 8683 ABC music file with the extracted tune(s)
Tune-7040-learnM.ps 100947 PostScript
Tune-7040-learnM.txt 8683 Plain-text file with the extracted tune(s)
Tune-70400-get.log 1407 Log file, useful mostly for debugging
Tune-70402-get.log 3640 Log file, useful mostly for debugging
Tune-70406-get.log 175275 Log file, useful mostly for debugging
Tune-70407-get.log 12235 Log file, useful mostly for debugging
These files should be available for 24 hours.