How to build an Analog Mixer - Additive Mixer and Multiplicative Mixer
Gax-lq01 4-in 4-out Audio Frequency Divider Audio Mixer Can Be Used For Online Multi-platform Live Broadcast Of Stage Show - Pro Audio Recording - AliExpress
Amazon.com: Unpowered Audio Mixers,Mixer Frequency 5-1900 Mhz RF up and Down Frequency Conversion Passive Mixer RMS-11 : Musical Instruments
Basics of frequency mixing and mixers
High Frequency Mixer Problem
Audio Signal Mixing
Understand RF Mixing & Frequency Mixers » Electronics Notes
EQ Frequency of Musical Instruments Cheat Sheet
How to build an frequency mixer circuit that I will use in an audio application - Quora