Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/abc/session/RoM/Waltz:Amoskeag-D-64-4.abc/waltz"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-97967-waltz.ps) >>/Users/jc/w/tmp/Tune-97967-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/abc/session/RoM/Waltz:Amoskeag-D-64-4.abc/waltz

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_97967.log 505438 Log file, useful mostly for debugging
Tune-97967-get.log 4100 Log file, useful mostly for debugging
Tune-97967-waltz.abc 170 ABC music file with the extracted tune(s)
Tune-97967-waltz.ps 6 PostScript
Tune-97967-waltz.txt 170 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.