Create a Redrum Drum Computer in Reason's rack window by right-clicking in it, selecting "create" and choosing the Redrum in the program's list of synthesizers and effect boxes. The program should auto-route the Redrum to your mixing board, so there is no immediate need for additional routing. If you do wish to reroute the machine, pressing "tab" on your keyboard will flip the rack window around, giving you a view of the virtual cables and inputs used to connect devices to one another. Here, you may connect individual drums to separate tracks and devices, or even use the gate ins and outs to trigger other drums or full synthesizers.
Load your samples or drum kit into the Redrum by selecting one of the machine's 11 load buttons (indicated by a picture of a file folder). The button in the lower left corner is used for loading entire kits, which will assign a preselected sample to each drum region, while the other 10 are used for assigning drums individually. You are not just limited to drums here; any .wav or .aif file can be loaded into the Redrum, so any vocal samples or sound effect you wish to use can be applied.
Alter your drum samples to your liking. Each drum sample is given a set of knobs, enabling you to not just tweak the entire kit at once but each drum on its own. The s1 and s2 knobs are used for increasing the signal sent to any additional effect racks the Redrum may be wired to, standard volume and pan controls are included for each drum and the pitch, tone, velocity-to-volume, start, velocity-to-sample start and pitch bend knobs as well as the decay/gate switch are all used for fine-tuning your samples.
Create drum loops to be used in the Reason sequencer window. Redrum allows for 32 separate drum loops to be created within it, each at different lengths and speeds. Select your drums one at a time and use the step buttons at the bottom of the Redrum to apply them to each loop, which can be navigated using the one to eight and A to D buttons to the left. The edit steps switch and pattern length display are used to change the amount of steps in your loop, the resolution increases and decreases the speed and the dynamic and flam functions are used to edit the intensity of each triggered sample.
Apply your loops to a song in the Reason sequencer window using the Redrum pattern lane. In the sequencer window, you may choose one of the loops you created and draw it into whichever part of the song you like, or copy and paste the patterns into selected loop zones.