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Thanks!!!!!!!Is it correct that the underlying hypothesis for this analog "sum" unit is that almost no input current should be drawn from the output device - i.e. very high load ?Is it correct that the output is then the arithmetic mean not the sum of the input voltages (i.e. (V1+V2+...V4)/4) ?Additional thought: say I want mix the audio signals from a (iPhone) microphone with a line-in source: how do I protect the microphone itself from experiencing an input current caused by the other input? A diode? How do I chose the diode and where do I place it in the circuit?