Any way to "turn on" speaker phone while not in a call?

[EyeB]

I'm trying to get the phone to play louder while driving so I can listen to the streaming music. Problem is the max volume is too quite still and I've applied the patch to up volume. It works but towards the high end it seems to distort the sound, like the speakers are being forced (well it's true if I worded it right)

So im wondering is it possible to get sound to play out the speaker phone like it does in calls? Since the speakerphone as good quality sound and volume, it's a shame I cant get it to work on other things...