8 knobs midi controller

hello everyone.

finally i've made my first plug&play midi controller. brain - teensy 2.0. code - from one of http://fuzzywobble.com/ tutorials. price just for aluminium box and pots ~ $20. so, with brain and knobs it's around $40.

http://s30.postimg.org/5to0s4h7l/WP_000041.jpg
http://s30.postimg.org/3ntpxmdr5/WP_000052.jpg

i've tried using HCF4051BE multiplexer, but there were a strange conflict between pots. i was testing multiplexer using just two pots, maybe that caused the glitch. any ideas?

next step is to add 4x4 button matrix with led support, few extra buttons and wooden top panel.