General questions about bluetooth

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http://androidforums.com – Hi. Thinking about buying an audio system and most of these now come with an ipod dock. I dont have an ipod but was thinking I could use a bluetooth dongle in it - ive found two for sale, one made by kitsound and the other a layen I sync. So, if I use one of these, I could play music on my tab, using the in built music app and send it to the audio system via bluetooth. The question is, how to I turn off the speakers on the tab when doing that? I cant find any setting to do that. Thanks. Ps, any views on the best bluetooth adapter/ dongle to buy? (General)