What does the hi-z button do on my audio mixer?
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Jordan Kettner Selected answer as best
You should use the Hi-Z button any time that you connect an instrument with magnetic pickups (electric guitar, bass guitar) directly to your audio mixer.
The Hi-Z button will match the impedance and make sure these instruments sound their best.
If you don’t have a Hi-Z button, you can use a DI box.
More info here: https://kettnercreative.com/audio-mixer/hi-z-button/
Jordan Kettner Selected answer as best