pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-98104-Gordon_Duncan.ps) >>/Users/jc/w/tmp/Tune-98104-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/by/Gordon_Duncan.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-98104-Gordon_Duncan.abc 24815 ABC music file with the extracted tune(s)
Tune-98104-Gordon_Duncan.ps 362291 PostScript
Tune-98104-Gordon_Duncan.txt 24815 Plain-text file with the extracted tune(s)
Tune-98104-get.log 23042 Log file, useful mostly for debugging
These files should be available for 24 hours.