pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-33688-sett.ps) >>/Users/jc/w/tmp/Tune-33688-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EliasHowe/MusiciansCompanionP2/sett.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-33688-get.log 9481 Log file, useful mostly for debugging
Tune-33688-sett.abc 561 ABC music file with the extracted tune(s)
Tune-33688-sett.ps 31036 PostScript
Tune-33688-sett.txt 561 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.