pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-68390-CR92.ps) >>/Users/jc/w/tmp/Tune-68390-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/abc/Contra/CR92.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-68390-CR92.abc 1504 ABC music file with the extracted tune(s)
Tune-68390-CR92.ps 47415 PostScript
Tune-68390-CR92.txt 1504 Plain-text file with the extracted tune(s)
Tune-68390-get.log 4349 Log file, useful mostly for debugging
These files should be available for 24 hours.