pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-6958-3000_Title.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-6958-3000_Title.ps 2>>/Users/jc/w/tmp/Tune-6958-get.log" returned status 256.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6958-3000_Title.ps) >>/Users/jc/w/tmp/Tune-6958-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ACMV/3000_Title.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_69581.log 1654 Log file, useful mostly for debugging
Form_69583.log 851 Log file, useful mostly for debugging
Form_69585.log 838 Log file, useful mostly for debugging
Form_69589.log 982 Log file, useful mostly for debugging
Tune-6958-3000_Title.abc 486 ABC music file with the extracted tune(s)
Tune-6958-3000_Title.ps 30513 PostScript
Tune-6958-3000_Title.txt 486 Plain-text file with the extracted tune(s)
Tune-6958-461_Comical_Fellow.abc 1140 ABC music file with the extracted tune(s)
Tune-6958-461_Comical_Fellow.ps 34492 PostScript
Tune-6958-461_Comical_Fellow.txt 1140 Plain-text file with the extracted tune(s)
Tune-6958-get.log 9373 Log file, useful mostly for debugging
Tune-69587-get.log 177468 Log file, useful mostly for debugging
Tune-69589-get.log 9265 Log file, useful mostly for debugging
These files should be available for 24 hours.