pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-33913-AsTimeGoesBy.ps) >>/Users/jc/w/tmp/Tune-33913-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/fake/AsTimeGoesBy.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_33913.log 1561475 Log file, useful mostly for debugging
Tune-33913-AsTimeGoesBy.abc 2481 ABC music file with the extracted tune(s)
Tune-33913-AsTimeGoesBy.ps 53899 PostScript
Tune-33913-AsTimeGoesBy.txt 2481 Plain-text file with the extracted tune(s)
Tune-33913-get.log 5543 Log file, useful mostly for debugging
These files should be available for 24 hours.