pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-266-Kerr_MM2-V1.ps) >>/Users/jc/w/tmp/Tune-266-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM2/Kerr_MM2-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_26604.log 144622 Log file, useful mostly for debugging
Coll_26625.log 143412 Log file, useful mostly for debugging
Coll_26646.log 280291 Log file, useful mostly for debugging
Coll_26656.log 267609 Log file, useful mostly for debugging
Coll_26661.log 141597 Log file, useful mostly for debugging
Coll_26696.log 146437 Log file, useful mostly for debugging
Form_26615.log 757 Log file, useful mostly for debugging
Form_26690.log 737 Log file, useful mostly for debugging
Form_26695.log 778 Log file, useful mostly for debugging
Tune-266-Kerr_MM2-V1.abc 375 ABC music file with the extracted tune(s)
Tune-266-Kerr_MM2-V1.ps 34300 PostScript
Tune-266-Kerr_MM2-V1.txt 375 Plain-text file with the extracted tune(s)
Tune-266-get.log 4175 Log file, useful mostly for debugging
Tune-26612-get.log 1438 Log file, useful mostly for debugging
Tune-26622-get.log 65946 Log file, useful mostly for debugging
Tune-26623-get.log 4794 Log file, useful mostly for debugging
Tune-26642-get.log 3147 Log file, useful mostly for debugging
Tune-26676-get.log 3592 Log file, useful mostly for debugging
Tune-26681-get.log 3247 Log file, useful mostly for debugging
Tune-26697-get.log 3966 Log file, useful mostly for debugging
These files should be available for 24 hours.