pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86230-21643_NELSE_MOWBRAYS_REEL.ps) >>/Users/jc/w/tmp/Tune-86230-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/21643_NELSE_MOWBRAYS_REEL.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_86230.log 264661 Log file, useful mostly for debugging
Find_86230.log 1666 Log file, useful mostly for debugging
Tune-86230-21643_NELSE_MOWBRAYS_REEL.abc 643 ABC music file with the extracted tune(s)
Tune-86230-21643_NELSE_MOWBRAYS_REEL.ps 37561 PostScript
Tune-86230-21643_NELSE_MOWBRAYS_REEL.txt 643 Plain-text file with the extracted tune(s)
Tune-86230-get.log 4964 Log file, useful mostly for debugging
These files should be available for 24 hours.