pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-43893-11191-Heros_Quickstep-V1.ps) >>/Users/jc/w/tmp/Tune-43893-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/11191-Heros_Quickstep-V1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_43893.log 454405 Log file, useful mostly for debugging
Tune-43893-11191-Heros_Quickstep-V1.abc 8057 ABC music file with the extracted tune(s)
Tune-43893-11191-Heros_Quickstep-V1.ps 125388 PostScript
Tune-43893-11191-Heros_Quickstep-V1.txt 8057 Plain-text file with the extracted tune(s)
Tune-43893-get.log 5078 Log file, useful mostly for debugging
These files should be available for 24 hours.