You can effectively use the Matrix as a modulation source, much like an LFO. Just like the LFOs in Reason's instrument devices, the Matrix can generate modulation that is synchronized to tempo, which has many advantages. Proceed as follows:
1. Create a Synthesizer (Subtractor or Malström).
2. Create a Matrix Pattern Sequencer, or if one already exists, set it to an empty pattern.
These two devices may or may not be connected (by autorouting) via the synthesizers Sequencer Control inputs - it doesn't matter for this example.
3. Flip the rack around and connect the Curve CV output on the Matrix back panel to the "Amp Level" Modulation input on the synthesizer.
This parameter is used for modulating the output level (volume) of the synthesizer. Volume modulation is often referred to as Tremolo. You can use a unipolar curve for this example.
4. Flip the rack back again, and switch the Matrix to display the Curve pattern window.
You should now see an empty pattern window, with no Gate or Curve events visible.
5. Draw a curve with alternating high and low values.
6. Activate Click on the transport panel.
7. Select the track that is routed to the synthesizer, so that you can play it from your MIDI keyboard.
8. Activate Play on the transport panel, and hold a chord down on your keyboard.
You should now hear the volume being modulated by the Curve pattern.
9. While still in play mode, you can use the Resolution knob to change the modulation "rate" in relation to the tempo.
For each clockwise resolution step the modulation speed is doubled and vice versa, but it will always stay in sync with the tempo.