pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-78319-156_Dixie.ps) >>/Users/jc/w/tmp/Tune-78319-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EverydaySongBook/156_Dixie.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_78319.log 264661 Log file, useful mostly for debugging
Tune-78319-156_Dixie.abc 1694 ABC music file with the extracted tune(s)
Tune-78319-156_Dixie.ps 41741 PostScript
Tune-78319-156_Dixie.txt 1694 Plain-text file with the extracted tune(s)
Tune-78319-get.log 65967 Log file, useful mostly for debugging
These files should be available for 24 hours.