Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Preston.abc/1799"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-26334-1799.ps) >>/Users/jc/w/tmp/Tune-26334-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/Preston.abc/1799

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-26334-082_the_Head_Dress.abc 669 ABC music file with the extracted tune(s)
Tune-26334-082_the_Head_Dress.pdf 15070 Portable Data Format
Tune-26334-082_the_Head_Dress.ps 35508 PostScript
Tune-26334-082_the_Head_Dress.txt 669 Plain-text file with the extracted tune(s)
Tune-26334-1799.abc 149 ABC music file with the extracted tune(s)
Tune-26334-1799.ps 6 PostScript
Tune-26334-1799.txt 149 Plain-text file with the extracted tune(s)
Tune-26334-get.log 9504 Log file, useful mostly for debugging
These files should be available for 24 hours.