As usual, it seems I was a bit hasty at first. I noticed that the scanned synthesis matrix file was not accurately included so I used csb64enc to include it all in one package, but I still get the OPCODEDIR64 error... Naturally there is a way to set this using the csd, but where should this directory point to on the remote system? Fixed with csb64encoded matrix file http://harbl.iiichan.net/csound/twilight44c.csd New output log time resolution is 1.003 ns 0dBFS level = 32768.0 Csound version 5.08.91 beta (double samples) Apr 4 2008 libsndfile-1.0.18pre20 UnifiedCSD: /srv/www/htdocs/netcsound/Results/1227351315__twilight44c.csd STARTING FILE Creating orchestra Creating score orchname: /tmp/filewdvTfn.orc scorename: /tmp/fileEmRdgA.sco orch compiler: 188 lines read opcode cpsmid k k opcode pan_equal_power aa ak instr 1 2 3 4 5 6 7 8 error: no legal opcode, line 99: aL butlp aL, 420 error: no legal opcode, line 101: aR butlp aR, 420  instr 25 error: no legal opcode, line 170: ahp1 butterhp ga1, 111 error: no legal opcode, line 172: ahp2 butterhp ga2, 111 error: illegal character ., line 175: aL, aR reverbsc ahp1, ahp2, 0.91, 18532                              ^ error: no legal opcode, line 175: aL, aR reverbsc ahp1, ahp2, 0.91, 18532 error: input arg 'aR' used before defined, line 178:  outs aL, aR error: input arg 'aL' used before defined, line 178:  outs aL, aR  ################################################################  # WARNING: OPCODEDIR64 IS NOT SET ! #  # Csound requires this environment variable to be set to find #  # its plugin libraries. If it is not set, you may experience #  # missing opcodes, audio/MIDI drivers, or utilities. #  ################################################################ 8 syntax errors in orchestra. compilation invalid Removing temporary file /tmp/fileEmRdgA.sco ... Removing temporary file /tmp/filewdvTfn.orc ...