pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-84849-CR-abc1.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-84849-CR-abc1.ps 2>>/Users/jc/w/tmp/Tune-84849-get.log" returned status 34304.
http://john-chambers.us/~jc/music/book/Gow/CR12/CR-abc1.abc

Error exit status 34304; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 ]
filesizedescription
Tune-84849-CR-abc1.abc 389444 ABC music file with the extracted tune(s)
Tune-84849-CR-abc1.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-84849-CR-abc1.ps 3122398 PostScript
Tune-84849-CR-abc1.txt 389444 Plain-text file with the extracted tune(s)
Tune-84849-get.log 260354 Log file, useful mostly for debugging
These files should be available for 24 hours.