pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-401-CW01.ps) >>/Users/jc/w/tmp/Tune-401-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/contra/CW01.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-401-CW01.abc 1801 ABC music file with the extracted tune(s)
Tune-401-CW01.ps 44206 PostScript
Tune-401-CW01.txt 1801 Plain-text file with the extracted tune(s)
Tune-401-get.log 4224 Log file, useful mostly for debugging
These files should be available for 24 hours.