pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-50565-x16.ps) >>/Users/jc/w/tmp/Tune-50565-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/contra/x16.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-50565-get.log 3726 Log file, useful mostly for debugging
Tune-50565-x16.abc 861 ABC music file with the extracted tune(s)
Tune-50565-x16.ps 36275 PostScript
Tune-50565-x16.txt 861 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.