pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-83159-DownYonder2.ps) >>/Users/jc/w/tmp/Tune-83159-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Square/DownYonder2.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_83159.log 232345 Log file, useful mostly for debugging
Tune-83159-DownYonder2.abc 808 ABC music file with the extracted tune(s)
Tune-83159-DownYonder2.ps 42007 PostScript
Tune-83159-DownYonder2.txt 808 Plain-text file with the extracted tune(s)
Tune-83159-get.log 4426 Log file, useful mostly for debugging
These files should be available for 24 hours.