That tremolo plugin is one you might not think of, but it's just about the most comprehensive amplitude-modulation plugin imaginable.
Forget the tremolo knob on your guitar amplifier, this is something way beyond that. In addition to the traditional sine wave modulator and classic surf-music effect, this can also apply complex modulations (up to 8 harmonically-related LFOs) to multiple frequency bands and really mix up anything you feed into it. The bands themselves can be modulated, resulting in swept-filter type effects.
I'm not a big fan of mangler effects in general, but I've had a lot of fun demoing this one. Try just setting up a simple drum pattern with SONAR's step sequencer and then running it through the tremolo plugin.