pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-16096-742_Tempest.ps) >>/Users/jc/w/tmp/Tune-16096-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1782/Thompson/742_Tempest.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_16096.log 268875 Log file, useful mostly for debugging
Tune-16096-742_Tempest.abc 868 ABC music file with the extracted tune(s)
Tune-16096-742_Tempest.ps 33802 PostScript
Tune-16096-742_Tempest.txt 868 Plain-text file with the extracted tune(s)
Tune-16096-get.log 4498 Log file, useful mostly for debugging
These files should be available for 24 hours.