pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-37637-PRATIGRO.ps) >>/Users/jc/w/tmp/Tune-37637-get.log 2>&1" returned status 256
http://back.numachi.com:8000/dtrad/abc/PRATIGRO.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
Tune-37637-PRATIGRO.abc 277 ABC music file with the extracted tune(s)
Tune-37637-PRATIGRO.ps 33233 PostScript
Tune-37637-PRATIGRO.txt 277 Plain-text file with the extracted tune(s)
Tune-37637-get.log 4293 Log file, useful mostly for debugging
These files should be available for 24 hours.