pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-56850-MusiciansCompanionP1-1842-V2.abc -F fmt/pdf_65.fmt +s 0.65 +maxs 2000 )>/Users/jc/w/tmp/Tune-56850-MusiciansCompanionP1-1842-V2.ps 2>>/Users/jc/w/tmp/Tune-56850-get.log" returned status 34304.
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Error exit status 34304; here are some files to check:

[get.cgi V=1/1 B=0 scale=0.65 512x512 PDF]
filesizedescription
Tune-56850-MusiciansCompanionP1-1842-V2.abc 297574 ABC music file with the extracted tune(s)
Tune-56850-MusiciansCompanionP1-1842-V2.pdf 2255339 Portable Data Format
Tune-56850-MusiciansCompanionP1-1842-V2.ps 1171940 PostScript
Tune-56850-MusiciansCompanionP1-1842-V2.txt 297574 Plain-text file with the extracted tune(s)
Tune-56850-get.log 224369 Log file, useful mostly for debugging
These files should be available for 24 hours.