pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7334-NEFRT.ps) >>/Users/jc/w/tmp/Tune-7334-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Contra/NEFRT.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_73340.log 813133 Log file, useful mostly for debugging
Coll_73346.log 145382 Log file, useful mostly for debugging
Tune-7334-NEFRT.abc 76916 ABC music file with the extracted tune(s)
Tune-7334-NEFRT.ps 826694 PostScript
Tune-7334-NEFRT.txt 76916 Plain-text file with the extracted tune(s)
Tune-7334-get.log 96515 Log file, useful mostly for debugging
Tune-73345-get.log 3312 Log file, useful mostly for debugging
Tune-73348-get.log 11438 Log file, useful mostly for debugging
These files should be available for 24 hours.