pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-38094-Book18.ps) >>/Users/jc/w/tmp/Tune-38094-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/SCD/Book18.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-38094-Book18.abc 32911 ABC music file with the extracted tune(s)
Tune-38094-Book18.ps 393473 PostScript
Tune-38094-Book18.txt 32911 Plain-text file with the extracted tune(s)
Tune-38094-get.log 34338 Log file, useful mostly for debugging
These files should be available for 24 hours.