Launch your preferred digital audio workstation, for example Logic or Cubase. Double-click the desktop icon or click "Start, "Programs" and select the program. If using a Mac, click the desktop icon once or select the program from the "Applications" folder. Click "File" and select "New." This opens a brand new session.
Connect a MIDI controller to your computer using a USB cable.
Set the tempo. Locate the the tempo box in the session interface, it is typically positioned bottom-center. The typical default tempo for new songs is 120 BPM. Delete this and enter "70" into the box. Hit "Return." This configures the tempo of the entire track to 70 beats per minute, which is approximately one beat every 1.16 seconds.
Open the drum editor tool in your workstation. The method for opening the editor varies slightly depending on which program you use, but it is typically located under the "Instruments" menu. For example, in Apple's Logic program, click "Media," "Instruments," and select "Ultrabeat." This opens a grid interface, the vertical axis represents drums, for example "Sub Bass Drum" and the horizontal axis represent time, measured in beats.
Select a drum kit. Click "Kits" and click on an option that you like. If necessary, audition a few kits by opening them and hitting the piano key graphic to trigger them. Use a kit with very low frequency bass drums and thin snare sounds.
Program a syncopated one measure beat. To make a beat, click on a square corresponding to the instrument and beat. For example, to put a bass on the first beat of the first bar, click the first square on the row corresponding to the bass drum. For syncopation, put a prominent drum sound, such as hi-hat on the off beat. Once you've created a suitable loop, drag it onto the channel strip to export it. Repeat this step seven times. Create an extra loop in the same way, identical to the first but minus the kick drum. The lack of kick drum at the end of the final loop creates a characteristic "Bass Drop." This provides an eight measure drum loop.
Click "File" and click "New MIDI Track." Click "Instruments" and select a deep bass sound such as "Deep Analog Bass." Click "Effects" and select "Modulation." Adjust the "Rate" parameter to approximately 60 per cent for a "wobbly" Dubstep bass sound. Hit "Record" and play in your bass line using the connected MIDI controller.