pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-8383-Kohlers2.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-8383-Kohlers2.ps 2>>/Users/jc/w/tmp/Tune-8383-get.log" returned status 34304.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8383-Kohlers2.ps) >>/Users/jc/w/tmp/Tune-8383-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kohlers/Kohlers2.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_83833.log 264661 Log file, useful mostly for debugging
Form_83832.log 2616 Log file, useful mostly for debugging
Form_83835.log 964 Log file, useful mostly for debugging
Tune-8383-Kohlers2.abc 157625 ABC music file with the extracted tune(s)
Tune-8383-Kohlers2.ps 718642 PostScript
Tune-8383-Kohlers2.txt 157625 Plain-text file with the extracted tune(s)
Tune-8383-get.log 141731 Log file, useful mostly for debugging
Tune-83832-get.log 7875 Log file, useful mostly for debugging
Tune-83835-get.log 7984 Log file, useful mostly for debugging
Tune-83836-21271_DUNFERMLINE_RACES.abc 538 ABC music file with the extracted tune(s)
Tune-83836-21271_DUNFERMLINE_RACES.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-83836-21271_DUNFERMLINE_RACES.ps 35881 PostScript
Tune-83836-21271_DUNFERMLINE_RACES.txt 538 Plain-text file with the extracted tune(s)
Tune-83836-get.log 5548 Log file, useful mostly for debugging
Tune-83837-Kohlers1.abc 145438 ABC music file with the extracted tune(s)
Tune-83837-Kohlers1.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-83837-Kohlers1.ps 1823670 PostScript
Tune-83837-Kohlers1.txt 145438 Plain-text file with the extracted tune(s)
Tune-83837-get.log 147186 Log file, useful mostly for debugging
Tune-83838-get.log 6377 Log file, useful mostly for debugging
Tune-83839-21253_BILLY_MILL.abc 639 ABC music file with the extracted tune(s)
Tune-83839-21253_BILLY_MILL.ps 38822 PostScript
Tune-83839-21253_BILLY_MILL.txt 639 Plain-text file with the extracted tune(s)
Tune-83839-get.log 4599 Log file, useful mostly for debugging
These files should be available for 24 hours.