pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9006-1758_Cahusac_24CD.ps) >>/Users/jc/w/tmp/Tune-9006-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1758_Cahusac_24CD.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_90067.log 282010 Log file, useful mostly for debugging
Tune-9006-1758_Cahusac_24CD.abc 15708 ABC music file with the extracted tune(s)
Tune-9006-1758_Cahusac_24CD.ps 139988 PostScript
Tune-9006-1758_Cahusac_24CD.txt 15708 Plain-text file with the extracted tune(s)
Tune-9006-get.log 18333 Log file, useful mostly for debugging
Tune-90061-get.log 13560 Log file, useful mostly for debugging
These files should be available for 24 hours.