pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7836-Shano_Dusho_waltz-C,D-20-4w8.ps) >>/Users/jc/w/tmp/Tune-7836-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/session/waltz/Shano_Dusho_waltz-C,D-20-4w8.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-7836-Shano_Dusho_waltz-C,D-20-4w8.abc 2252 ABC music file with the extracted tune(s)
Tune-7836-Shano_Dusho_waltz-C,D-20-4w8.ps 45545 PostScript
Tune-7836-Shano_Dusho_waltz-C,D-20-4w8.txt 2252 Plain-text file with the extracted tune(s)
Tune-7836-get.log 6627 Log file, useful mostly for debugging
These files should be available for 24 hours.