Sound out of both audio sources

So I recently got a speaker that fits into my headphone jack on my 3rd gen ipod touch, the only downside to that is it cuts out the sound all together on my ipod. So I was wondering if there is an app that will allow the ipod to play sound from both the headphone jack and the speakers? My ipod is already jailbroken so it doesn't really matter where I get the app from.

Thanks!