Not ideal. If you really want that one track to stand out more in the mix just turn the other tracks down a bit. Then you can turn the master up to get back the overall volume. Or at least that's how I do it...but that's using the LMMS FX mixer like a real studio mixer so there may be a better way ;...
Are you sure you're not just talking about the "metronome" noise it makes so you can stay in time when you're recording ? It's supposed to do that.
Steve