pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-10794-1813_Button_Whitaker.ps) >>/Users/jc/w/tmp/Tune-10794-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/dfty/1813_Button_Whitaker.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-10794-1813_Button_Whitaker.abc 27754 ABC music file with the extracted tune(s)
Tune-10794-1813_Button_Whitaker.ps 159332 PostScript
Tune-10794-1813_Button_Whitaker.txt 27754 Plain-text file with the extracted tune(s)
Tune-10794-get.log 23831 Log file, useful mostly for debugging
These files should be available for 24 hours.