pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-55632-10901_THE_MARQUIS_OF_HUNTLY.ps) >>/Users/jc/w/tmp/Tune-55632-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/10901_THE_MARQUIS_OF_HUNTLY.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_55632.log 825 Log file, useful mostly for debugging
Sess-55632.log 5730731 Log file, useful mostly for debugging
Tune-55632-10901_THE_MARQUIS_OF_HUNTLY.abc 1113 ABC music file with the extracted tune(s)
Tune-55632-10901_THE_MARQUIS_OF_HUNTLY.ps 45187 PostScript
Tune-55632-10901_THE_MARQUIS_OF_HUNTLY.txt 1113 Plain-text file with the extracted tune(s)
Tune-55632-get.log 4946 Log file, useful mostly for debugging
These files should be available for 24 hours.