pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-63803-CR4-abc1.ps) >>/Users/jc/w/tmp/Tune-63803-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Gow/CR4-abc1.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-63803-CR4-abc1.abc 93752 ABC music file with the extracted tune(s)
Tune-63803-CR4-abc1.ps 938438 PostScript
Tune-63803-CR4-abc1.txt 93752 Plain-text file with the extracted tune(s)
Tune-63803-get.log 54845 Log file, useful mostly for debugging
These files should be available for 24 hours.