Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Aird/Aird_vol2.abc/abc1"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1297-abc1.ps) >>/Users/jc/w/tmp/Tune-1297-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Aird/Aird_vol2.abc/abc1

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_1297.log 261851 Log file, useful mostly for debugging
Form_12971.log 1667 Log file, useful mostly for debugging
Form_12977.log 839 Log file, useful mostly for debugging
Tune-1297-abc1.abc 151 ABC music file with the extracted tune(s)
Tune-1297-abc1.ps 6 PostScript
Tune-1297-abc1.txt 151 Plain-text file with the extracted tune(s)
Tune-1297-get.log 3948 Log file, useful mostly for debugging
Tune-12971-Theodore.abc 376 ABC music file with the extracted tune(s)
Tune-12971-Theodore.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-12971-Theodore.ps 33708 PostScript
Tune-12971-Theodore.txt 376 Plain-text file with the extracted tune(s)
Tune-12971-get.log 5153 Log file, useful mostly for debugging
Tune-12975-get.log 2834 Log file, useful mostly for debugging
Tune-12977-get.log 3612 Log file, useful mostly for debugging
These files should be available for 24 hours.