If this sounds useful, check out Sound Trigger in Google Play and let me know what you think:
https://play.google.com/store/apps/deta ... undtrigger
This is the 1.0 release, so there are still a number of features to be added, such as MP3 and OGG support. But I believe the app is stable and ready for prime time.
If you find bugs or have feature requests, you can either contact me directly or file issues in Bitbucket:
https://bitbucket.org/burtin/sound-trigger
You can also see the complete list of known issues and feature requests at the Bitbucket site.
And if you like the app, I encourage you to submit a positive review to Google Play.
Thanks in advance,
Boris