Sound Issues

I'm having trouble implementing a good music volume control. If I use any amount of cross fading when I use a slider to set the music volume using the setTargetVolume method on the track, it is very laggy in that instead of setting the volume immediately and appropriately, it fades it over several seconds depending on what the setCrossfadeinTime and setCrossfadeoutTime is set to. Is there any way get a method like setMasterGain for just music tracks? If not, what is the suggested method of setting the music volume?

My second issue is that if I switch streaming on, by passing in "true" in createAudioTrack, things don't work well at all. Tracks overlap, load funny, repeat, etc… I believe I mentioned this months ago, but haven't heard anything on it so I thought I'd mention it again.

Many thanks