This button PCB from Helder has the following built in:
1.X&Y Button Drill template
2.PWM Audio Filter (you NEED to Program the config.txt to use PWM Audio)
4.Built in Headphone Socket with proper Stereo mixed into the Mono Speaker Ouput
5.Atmega32U4 MCU to handle controls and Analog Stick (already preprogrammed!)
6.USB Hub (3 free ports,1 is connected to atmega32U4)
7.Four additional analog input pads for the on-board atmega32U4, which you can use for things like low-battery indicators, a second analog stick, etc.
Available late January 2017