pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3170-0661_MY_OLD_AUNT_SARAH.ps) >>/Users/jc/w/tmp/Tune-3170-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BostonCollection/0661_MY_OLD_AUNT_SARAH.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_31700.log 835 Log file, useful mostly for debugging
Tune-3170-0661_MY_OLD_AUNT_SARAH.abc 598 ABC music file with the extracted tune(s)
Tune-3170-0661_MY_OLD_AUNT_SARAH.ps 36971 PostScript
Tune-3170-0661_MY_OLD_AUNT_SARAH.txt 598 Plain-text file with the extracted tune(s)
Tune-3170-get.log 4891 Log file, useful mostly for debugging
These files should be available for 24 hours.