pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-33536-l.ps) >>/Users/jc/w/tmp/Tune-33536-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/terra.es/personal8/niltoni/l.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-33536-get.log 4309 Log file, useful mostly for debugging
Tune-33536-l.abc 299 ABC music file with the extracted tune(s)
Tune-33536-l.ps 36317 PostScript
Tune-33536-l.txt 299 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.