I've created an application called da_Sound that plays audio files using command line parameters. Basically, it has a list of audio files, each with a description and file name along with individual settings for volume, pan (balance), pitch (speed), loop and output (different sound cards).

Each sound can be played, paused, resumed and stopped independently. This allows you to have (for example) background tracks that loop by themselves, as well as "Spot FX" sounds. You can have many overlapping sounds - perfect for Halloween.

da_Sound is designed to be triggered by another application, such as Vixen, etc. Bug reports and feature suggestions are welcome.

Anyway, it's free to use. No nags, no spyware, etc. Enjoy.