Playing Two or More Sounds Concurrently --------------------------------------- Despite what you may have heard, you can indeed play two sounds concurrently on Windows systems. Director has always been able to do it so there's no reason why Authorware cannot do it too! Multiple WAV Files ------------------ Years ago, Microsoft developed an unsupported DLL to mix multiple WAV files on the fly. The DLL is called WAVEMIX.DLL. Microsoft released the source code for this DLL to the computer community so there are many different versions of this DLL floating around. WAVEMIX reads the audio files you want to play concurrently and mixes them together on the fly. With the WAVEMIX documentation, you can load the functions directly from the DLL. However, an easier solution is to use the BUDMIX UCD created by Gary Smith (http://www.mods.com.au). MIDI and WAV Files ------------------ Another option is to have, say, background MIDI music that plays smoothly as intermittent WAV files are activated in your piece. This can be done with Stefan van As' MIDILOOP UCD. This is available from Stefan's web site. (http://www.wirehub.nl/~dav-stefan)