pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-10574-ofpc_volume2.ps) >>/Users/jc/w/tmp/Tune-10574-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/OFPC/ofpc_volume2.txt

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-10574-get.log 35178 Log file, useful mostly for debugging
Tune-10574-ofpc_volume2.abc 356 ABC music file with the extracted tune(s)
Tune-10574-ofpc_volume2.ps 34743 PostScript
Tune-10574-ofpc_volume2.txt 356 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.