Pro Audio DIY | I was offering this german summing mixer here a couple of weeks ago just before refurbishing it | Facebook
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Stereo Audio Mixer Board Drive | Headphone Amplifier | Mixing Board | Njm3414 - 2 Ways/4 - Aliexpress
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Music Hackspace on Twitter: "DIY passive audio mixer built today at the workshop led by @CasperSoundman http://t.co/uXtt9e7Fo3" / Twitter
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