I came across a company based in Texas by the name of Livid Instruments. As well as manufacturing their own brand of MIDI controllers, they also make a MIDI enabled microcontroller board which allows you to add various controls such as potentiometers, buttons and LED's in as many configurations as you can think of. It's a relatively simple process and their technical support is incredibly good should you get stuck or have any questions, of which I had many.
Step 1: Choose your controls
Next came the analog controls. Analog in this sense means anything that will output a specific value/voltage such as a slider, rotary potentiometer or force sensitive resistor. It's important to note here that potentiometers with values between 10k and 100k work best with the BrainWith all my shop bought controllers I've always found that they were lacking even just an extra 2 or 3 sliders so I decided to play it safe and go for 11, one of them being a dedicated crossfader. I wanted to recreate the look of the effects racks I use the most in Ableton on my controller so for rotary potentiometers I chose to include two lots of 8 in a 4x2 configuration, two lots of 3 for channel EQ's and 4 extra just in case. I made a crude design in Sketchbook express which you can see in the images to get a rough idea of how to layout the controls and to figure out whether I had enough controls for its purpose.