To adjust your sound, you will have to tinker with the settings a bit. Make sure your Compressor Threshold is very low, because this will allow your lead to become quieter. Then adjust the ratio. This is probably the most important factor in how much flutuation you get. If you ration is very low, you won't be able to tell the difference. If it is very high, like 30:1 for example, your beat will go from near silent to blasting loud when the beat hits.
For another special trick, mute your beat (bus 1) and the lead will still fluctuate to the unheard notes. It can give a very unique, pumping sound.