pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-10631-Kerr_MM4-V1.ps) >>/Users/jc/w/tmp/Tune-10631-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM4/Kerr_MM4-V1.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Form_10631.log 857 Log file, useful mostly for debugging
Tune-10631-Kerr_MM4-V1.abc 568 ABC music file with the extracted tune(s)
Tune-10631-Kerr_MM4-V1.ps 39352 PostScript
Tune-10631-Kerr_MM4-V1.txt 568 Plain-text file with the extracted tune(s)
Tune-10631-get.log 4331 Log file, useful mostly for debugging
These files should be available for 24 hours.