4 Simple Audio Mixer Circuits diagram using FET and ICs | ElecCircuit.com
Mono Audio Mixer #2 Article by Ray Wilson This project is an older design and has most likely been superceded by a newer one. However, it is still a viable design and useful for your home-brew synth. Sorry but most of these do not have circuit descriptions ...
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4 Simple Audio Mixer Circuits diagram using FET and ICs | ElecCircuit.com
How to build an audio mixer
Basic audio mixer with tone control
Muti-channel audio mixer circuit based on LM3900 IC. Four channels.