pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6495-Book_Vals.ps) >>/Users/jc/w/tmp/Tune-6495-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/scand/Book_Vals.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_64950.log 277305 Log file, useful mostly for debugging
Coll_64951.log 284330 Log file, useful mostly for debugging
Coll_64954.log 288545 Log file, useful mostly for debugging
Tune-6495-Book_Vals.abc 36693 ABC music file with the extracted tune(s)
Tune-6495-Book_Vals.ps 388412 PostScript
Tune-6495-Book_Vals.txt 36693 Plain-text file with the extracted tune(s)
Tune-6495-get.log 12382 Log file, useful mostly for debugging
Tune-64954-get.log 4825 Log file, useful mostly for debugging
These files should be available for 24 hours.