Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/abc/session/RoM/R001.abc/reel"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9668-reel.ps) >>/Users/jc/w/tmp/Tune-9668-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/abc/session/RoM/R001.abc/reel

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_96681.log 263256 Log file, useful mostly for debugging
Coll_96682.log 281522 Log file, useful mostly for debugging
Coll_96687.log 263256 Log file, useful mostly for debugging
Coll_96688.log 266066 Log file, useful mostly for debugging
Form_9668.log 933 Log file, useful mostly for debugging
Tune-9668-get.log 3958 Log file, useful mostly for debugging
Tune-9668-reel.abc 152 ABC music file with the extracted tune(s)
Tune-9668-reel.ps 6 PostScript
Tune-9668-reel.txt 152 Plain-text file with the extracted tune(s)
Tune-96682-get.log 5096 Log file, useful mostly for debugging
Tune-96683-032_Ding_Dong_Bell-001.svg 12018 Scalable Vector Graphics format
Tune-96683-032_Ding_Dong_Bell.abc 724 ABC music file with the extracted tune(s)
Tune-96683-032_Ding_Dong_Bell.txt 724 Plain-text file with the extracted tune(s)
Tune-96683-get.log 4321 Log file, useful mostly for debugging
Tune-96684-get.log 51912 Log file, useful mostly for debugging
Tune-96688-get.log 3496 Log file, useful mostly for debugging
These files should be available for 24 hours.