pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-46679-CSR-abc1.ps) >>/Users/jc/w/tmp/Tune-46679-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CSR-abc1.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_46679.log 459810 Log file, useful mostly for debugging
Form_46679.log 1897 Log file, useful mostly for debugging
Tune-46679-CSR-abc1.abc 366310 ABC music file with the extracted tune(s)
Tune-46679-CSR-abc1.ps 3704777 PostScript
Tune-46679-CSR-abc1.txt 366310 Plain-text file with the extracted tune(s)
Tune-46679-get.log 218358 Log file, useful mostly for debugging
These files should be available for 24 hours.