Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/JamesOswald/CPC/cresc.abc/proto"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1400-proto.ps) >>/Users/jc/w/tmp/Tune-1400-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPC/cresc.abc/proto

Error exit status 256; here are some files to check:

[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-1400-get.log 4015 Log file, useful mostly for debugging
Tune-1400-proto.abc 159 ABC music file with the extracted tune(s)
Tune-1400-proto.ps 6 PostScript
Tune-1400-proto.txt 159 Plain-text file with the extracted tune(s)
Tune-14007-10432_Marys_Dream-001.svg 20904 Scalable Vector Graphics format
Tune-14007-10432_Marys_Dream.abc 607 ABC music file with the extracted tune(s)
Tune-14007-10432_Marys_Dream.txt 607 Plain-text file with the extracted tune(s)
Tune-14007-get.log 4123 Log file, useful mostly for debugging
These files should be available for 24 hours.