pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4031-CPCvol1-abc2.ps) >>/Users/jc/w/tmp/Tune-4031-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/JamesOswald/CPCvol1-abc2.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_40314.log 144622 Log file, useful mostly for debugging
Find_40312.log 1411 Log file, useful mostly for debugging
Tune-4031-CPCvol1-abc2.abc 497 ABC music file with the extracted tune(s)
Tune-4031-CPCvol1-abc2.ps 35152 PostScript
Tune-4031-CPCvol1-abc2.txt 497 Plain-text file with the extracted tune(s)
Tune-4031-get.log 4430 Log file, useful mostly for debugging
These files should be available for 24 hours.