pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-75257-MayYarkersStr0.ps) >>/Users/jc/w/tmp/Tune-75257-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/MayYarkersStr0.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_75257.log 277305 Log file, useful mostly for debugging
Tune-75257-MayYarkersStr0.abc 849 ABC music file with the extracted tune(s)
Tune-75257-MayYarkersStr0.ps 40058 PostScript
Tune-75257-MayYarkersStr0.txt 849 Plain-text file with the extracted tune(s)
Tune-75257-get.log 4917 Log file, useful mostly for debugging
These files should be available for 24 hours.