pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9428-33_DA_AULD_RESTING_CHAIR.ps) >>/Users/jc/w/tmp/Tune-9428-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/HaandMeDoonDaFiddle/33_DA_AULD_RESTING_CHAIR.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_94280.log 265210 Log file, useful mostly for debugging
Coll_94281.log 270811 Log file, useful mostly for debugging
Coll_94282.log 741820 Log file, useful mostly for debugging
Coll_94284.log 325001 Log file, useful mostly for debugging
Form_94289.log 1072 Log file, useful mostly for debugging
Tune-9428-33_DA_AULD_RESTING_CHAIR.abc 847 ABC music file with the extracted tune(s)
Tune-9428-33_DA_AULD_RESTING_CHAIR.ps 34859 PostScript
Tune-9428-33_DA_AULD_RESTING_CHAIR.txt 847 Plain-text file with the extracted tune(s)
Tune-9428-get.log 4877 Log file, useful mostly for debugging
Tune-94281-get.log 9864 Log file, useful mostly for debugging
Tune-94282-get.log 13908 Log file, useful mostly for debugging
Tune-94283-get.log 11216 Log file, useful mostly for debugging
Tune-94284-get.log 7541 Log file, useful mostly for debugging
Tune-94285-get.log 8309 Log file, useful mostly for debugging
Tune-94287-get.log 4281 Log file, useful mostly for debugging
Tune-94289-get.log 9493 Log file, useful mostly for debugging
These files should be available for 24 hours.