pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5283-LightAndAiry2.ps) >>/Users/jc/w/tmp/Tune-5283-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/LightAndAiry2.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_5283.log 124745 Log file, useful mostly for debugging
Coll_52834.log 282925 Log file, useful mostly for debugging
Coll_52835.log 133129 Log file, useful mostly for debugging
Tune-5283-LightAndAiry2.abc 2772 ABC music file with the extracted tune(s)
Tune-5283-LightAndAiry2.ps 54978 PostScript
Tune-5283-LightAndAiry2.txt 2772 Plain-text file with the extracted tune(s)
Tune-5283-get.log 4885 Log file, useful mostly for debugging
These files should be available for 24 hours.