Multichannel development V1.2

Adding more channels to the system can have multiple sensor controlling different sounds or properties. This can be achieved on one microchip which could expand the system to another level.

Experiment:

A second channel was set up for the device both in hardware and the code, using customised midi function to send out Midi for separate Midi channels, however this needs to be done in the main loop to avoid midi conflicts within different channels when doing noteoff. Demo below shows two sensors, left control guitar sound and right bell.

Problems:

Two channel interference in the opposite way. The one activated later will drop down the data of the first sensor. This is understandable that two sensors are connected when making contact through human body and the ground, thus the body here help the electricity construct a close loop. Which also means the current system doesn't have the ability to run multi-channel without interference within one circuit.