You can also take this configuration one step further and add individual gain control for each of your channels, simply by adding a potentiometer before the resistor on the given channel, as shown below. Additionally you can add quite a few more resistors for extra channels as needed (although its best to disconnect unused resistors/channels as they contribute noise to the circuit).
The equation simplifies nicely in this case since all of the resistor values are equal, but you can easily change the values to set fixed gains for the channels. This circuit provides an output signal voltage according to the following equation: In your situation you would probably want to use an op amp in a summing amplifier configuration, shown below:
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