how to split audio with buffers?
This is a typical powered headphone splitter/amplifier. It is a single gain amp to multiple non-amplifying buffers. The 5.1kΩ Resistors represent the load. As it will be in parallel with your actual load, they won't affect much.



Notice, no pull-down resistors needed between the Gain Amp and Buffer Amps. This is as generic as it gets.