pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-90244-4231_Captain_OKain.ps) >>/Users/jc/w/tmp/Tune-90244-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CSR/4231_Captain_OKain.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_90244.log 1016 Log file, useful mostly for debugging
Tune-90244-4231_Captain_OKain.abc 918 ABC music file with the extracted tune(s)
Tune-90244-4231_Captain_OKain.ps 39401 PostScript
Tune-90244-4231_Captain_OKain.txt 918 Plain-text file with the extracted tune(s)
Tune-90244-get.log 4627 Log file, useful mostly for debugging
These files should be available for 24 hours.