Highlight Reason 4's main mixer by clicking on it. In Reason 4's "Create" menu, select "Redrum Drum Computer". This will open an instance of Redrum that is automatically connected to Reason's main mixer. You can press tab to toggle between the front and rear views of Reason to see that the cables are connected.
In Redrum's "Patch Select" menu, click the folder icon. This will open Reason's Factory Soundbank. Open the Redrum Drum Kits folder, and the underlying folder called "House Kits." Then select "House Kit 03." This will populate Redrum with 10 drum samples that you can program individually.
Preview each of the sounds by pressing the small triangle at the top of the numbered drum channels within Redrum, so that you know what each sounds like. Press the "Run" button at the bottom of Redrum. You will see a moving red light running across the numbers 1 through 16. This is Redrum's sixteen-step sequencer, playing one bar of music in 4:4 time. You can press "Run" again when you want to stop Redrum.
Press the "Select" button on Channel 1, the bass drum. Now click numbers 1, 5, 9, and 13 on the sequencer. This will trigger the bass drum on each quarter note of the bar. You will hear a "one, two, three, four" beat playing. Redrum will use pattern one as denoted in the pattern section.
Select Channel 2, the handclap. Click numbers 5 and 13 on the sequencer. This will trigger the snare drum on the second and fourth quarter notes. Select Channel 8, the high hat, and click 3, 7, 11, and 15 on the sequencer. You will now hear a drum track that is reminiscent of many dance music songs.
Customize your drum track by adding other sounds into the pattern. For example, use Channel 3 on step three of the sequencer and Channel 4 on step seven. You will now hear rhythmic tom drums in your beat.
Create other patterns using Redrum's "Pattern" menu. When playing Reason 4 you can switch between patterns to create a more varied and interesting drum track. For example, you could have one pattern where the bass drum is only triggered on steps one and two, or a pattern where the clap is triggered on steps five, thirteen and fifteen.