Akoestisch part1 : http://www.youtube.com/watch?v=TMQQOxIZNQ4
Electrisch part 2a : http://www.youtube.com/watch?v=kFa3u189IhU
Electrisch part 2b : http://www.youtube.com/watch?v=DU7F0snMDQs
Electrisch part 3 : http://www.youtube.com/watch?v=KuSihWz7LlQ
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