There are a number of artists using custom controllers with Ableton Live - and it's always fascinating to see how musicians approach things. In Ander's case, there's an impressive and beautiful array of LEDs, overlaid with knobs. Check out a glimpse of Ander's controller in this video from the Ableton Live User Group in Zürich:

You can learn more about Ander's controller and his music in this feature at Create Digital Music.