pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-95392-FCCD1.ps) >>/Users/jc/w/tmp/Tune-95392-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1800/Thompson/FCCD/FCCD1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-95392-FCCD1.abc 15713 ABC music file with the extracted tune(s)
Tune-95392-FCCD1.ps 116050 PostScript
Tune-95392-FCCD1.txt 15713 Plain-text file with the extracted tune(s)
Tune-95392-get.log 11477 Log file, useful mostly for debugging
These files should be available for 24 hours.