pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-16524-20092_Duncan_Gray.ps) >>/Users/jc/w/tmp/Tune-16524-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/ERM/20092_Duncan_Gray.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_16524.log 457009 Log file, useful mostly for debugging
Tune-16524-20092_Duncan_Gray.abc 507 ABC music file with the extracted tune(s)
Tune-16524-20092_Duncan_Gray.ps 34623 PostScript
Tune-16524-20092_Duncan_Gray.txt 507 Plain-text file with the extracted tune(s)
Tune-16524-get.log 7157 Log file, useful mostly for debugging
These files should be available for 24 hours.