pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4594-KeppochsRant1.ps) >>/Users/jc/w/tmp/Tune-4594-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/KeppochsRant1.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_4594.log 291355 Log file, useful mostly for debugging
Coll_45948.log 368963 Log file, useful mostly for debugging
Coll_45949.log 281520 Log file, useful mostly for debugging
Tune-4594-KeppochsRant1.abc 1741 ABC music file with the extracted tune(s)
Tune-4594-KeppochsRant1.ps 50432 PostScript
Tune-4594-KeppochsRant1.txt 1741 Plain-text file with the extracted tune(s)
Tune-4594-get.log 4871 Log file, useful mostly for debugging
These files should be available for 24 hours.