pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-72670-21531_LENA_1.ps) >>/Users/jc/w/tmp/Tune-72670-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/21531_LENA_1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_72670.log 2799 Log file, useful mostly for debugging
Tune-72670-21531_LENA_1.abc 974 ABC music file with the extracted tune(s)
Tune-72670-21531_LENA_1.ps 39529 PostScript
Tune-72670-21531_LENA_1.txt 974 Plain-text file with the extracted tune(s)
Tune-72670-get.log 4654 Log file, useful mostly for debugging
These files should be available for 24 hours.