pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-13395-ofpc_volume3.ps) >>/Users/jc/w/tmp/Tune-13395-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/OFPC/ofpc_volume3.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-13395-get.log 31124 Log file, useful mostly for debugging
Tune-13395-ofpc_volume3.abc 421 ABC music file with the extracted tune(s)
Tune-13395-ofpc_volume3.ps 35146 PostScript
Tune-13395-ofpc_volume3.txt 421 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.