pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-1847-voices.abc -F fmt/pdf_60.fmt +s 0.60 +maxs 2000 )>/Users/jc/w/tmp/Tune-1847-voices.ps 2>>/Users/jc/w/tmp/Tune-1847-get.log" returned status 256.
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1847-voices.ps) >>/Users/jc/w/tmp/Tune-1847-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/src/abcm2ps-8.13.18/voices.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Find_18472.log 1475 Log file, useful mostly for debugging
Find_18475.log 0 Log file, useful mostly for debugging
Form_18470.log 830 Log file, useful mostly for debugging
Form_18473.log 840 Log file, useful mostly for debugging
Form_18479.log 856 Log file, useful mostly for debugging
Tune-1847-get.log 0 Log file, useful mostly for debugging
Tune-1847-voices.abc 0 ABC music file with the extracted tune(s)
Tune-1847-voices.txt 0 Plain-text file with the extracted tune(s)
Tune-18470-get.log 3174 Log file, useful mostly for debugging
Tune-18471-get.log 3161 Log file, useful mostly for debugging
Tune-18476-get.log 3962 Log file, useful mostly for debugging
Tune-18479-get.log 3255 Log file, useful mostly for debugging
These files should be available for 24 hours.