Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/15302_Kettys_Scots_Measure.abc/all"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9599-all.ps) >>/Users/jc/w/tmp/Tune-9599-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/15302_Kettys_Scots_Measure.abc/all

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_95997.log 677731 Log file, useful mostly for debugging
Find_95993.log 1487 Log file, useful mostly for debugging
Tune-9599-all.abc 178 ABC music file with the extracted tune(s)
Tune-9599-all.ps 6 PostScript
Tune-9599-all.txt 178 Plain-text file with the extracted tune(s)
Tune-9599-get.log 4099 Log file, useful mostly for debugging
Tune-95996-all.abc 173 ABC music file with the extracted tune(s)
Tune-95996-all.pdf 2217 Portable Data Format
Tune-95996-all.ps 6 PostScript
Tune-95996-all.txt 173 Plain-text file with the extracted tune(s)
Tune-95996-get.log 4951 Log file, useful mostly for debugging
These files should be available for 24 hours.