Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Graded1/Gow-CSR3-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6916-Gow-CSR3-abc2.ps) >>/Users/jc/w/tmp/Tune-6916-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Graded1/Gow-CSR3-abc2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_69163.log 155166 Log file, useful mostly for debugging
Coll_69166.log 551153 Log file, useful mostly for debugging
Tune-6916-Gow-CSR3-abc2.abc 153 ABC music file with the extracted tune(s)
Tune-6916-Gow-CSR3-abc2.ps 6 PostScript
Tune-6916-Gow-CSR3-abc2.txt 153 Plain-text file with the extracted tune(s)
Tune-6916-get.log 4147 Log file, useful mostly for debugging
Tune-69160-get.log 6640 Log file, useful mostly for debugging
Tune-69161-get.log 4780 Log file, useful mostly for debugging
Tune-69162-get.log 4563 Log file, useful mostly for debugging
Tune-69168-20922_Columbian_Sett_tune_2.abc 1079 ABC music file with the extracted tune(s)
Tune-69168-20922_Columbian_Sett_tune_2.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-69168-20922_Columbian_Sett_tune_2.ps 35957 PostScript
Tune-69168-20922_Columbian_Sett_tune_2.txt 1079 Plain-text file with the extracted tune(s)
Tune-69168-get.log 5827 Log file, useful mostly for debugging
Tune-69169-get.log 4708 Log file, useful mostly for debugging
These files should be available for 24 hours.