This software can run standalone, and provide a simple and effective sequencer to boot!  It has built in instruments that are fully automatable.

Malestrom Is a graintable synth that has a preset library of hardcoded grainmaps that are routed to 2 oscilators, and then filtered by your choice of 4 differnt filter types spread and output into your mix.

The Subtractor is a simple 2 osc Subtractive FM synth that has a ring modulator, and 3 mixing modes for each oscilator.  each oscilator has up to 32 waveforms to choose from an it is fully automatable.

The Thor has a semi-modular interface that can utilize up to 3 oscilators each able to behave like a wavetable, a multi oscilator, an FM, PM, and analogue oscilator modes.  Then the signals can be filtered two filter banks by your choice of 6 different types of filters.  Now the signal can be further manipulated by programming the behavior of your synth in the matrix window, and has a built in effects processor with chorus  a third filter and delay.

These are just some of the many features in Reason 4.0 that make it so awesome!

Check it out here.

This program is a must have it has So many features that give you so much precise control over your mix that it will blow you away.

I has a built in Mixer, with 4 aux sends and up to 64 Inserts.  It has a step sequencer, and a midi sequencer with piano Roll display.  It has Audio in support, it has a pattern sequencer that can hold MIDI and Audio clips, that you can cut copy and splice how you want, it has support for VST and DX plugin architectures, and the best part of it all is that it is very inexpensive for what it can do.

The features are covered more thoroughly at the image-line website.