Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/4NCD/Kerr_MM3-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1280-Kerr_MM3-V1.ps) >>/Users/jc/w/tmp/Tune-1280-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/4NCD/Kerr_MM3-V1.abc

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

[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-1280-Kerr_MM3-V1.abc 148 ABC music file with the extracted tune(s)
Tune-1280-Kerr_MM3-V1.ps 6 PostScript
Tune-1280-Kerr_MM3-V1.txt 148 Plain-text file with the extracted tune(s)
Tune-1280-get.log 9922 Log file, useful mostly for debugging
Tune-12800-JamesOswald_CPC-abc1.abc 157 ABC music file with the extracted tune(s)
Tune-12800-JamesOswald_CPC-abc1.pdf 2217 Portable Data Format
Tune-12800-JamesOswald_CPC-abc1.ps 6 PostScript
Tune-12800-JamesOswald_CPC-abc1.txt 157 Plain-text file with the extracted tune(s)
Tune-12800-get.log 25640 Log file, useful mostly for debugging
Tune-12807-get.log 11287 Log file, useful mostly for debugging
Tune-12808-get.log 4486 Log file, useful mostly for debugging
Tune-12809-get.log 5858 Log file, useful mostly for debugging
These files should be available for 24 hours.