pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6480-Kerr_MM4-V1.ps) >>/Users/jc/w/tmp/Tune-6480-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
Coll_64800.log 65264 Log file, useful mostly for debugging
Coll_64802.log 66884 Log file, useful mostly for debugging
Coll_64803.log 326563 Log file, useful mostly for debugging
Coll_64805.log 63914 Log file, useful mostly for debugging
Form_64801.log 744 Log file, useful mostly for debugging
Form_64804.log 733 Log file, useful mostly for debugging
Tune-6480-Kerr_MM4-V1.abc 302 ABC music file with the extracted tune(s)
Tune-6480-Kerr_MM4-V1.ps 34680 PostScript
Tune-6480-Kerr_MM4-V1.txt 302 Plain-text file with the extracted tune(s)
Tune-6480-get.log 20460 Log file, useful mostly for debugging
Tune-64803-get.log 4032 Log file, useful mostly for debugging
Tune-64804-get.log 5342 Log file, useful mostly for debugging
These files should be available for 24 hours.