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Audio: How can I listen to stereo sound through only one of the speakers? - Quora
How to...Connecting stereo outputs to mono input
How do you split stereo to left/right mono for dual stereo speakers? - Sound Design Stack Exchange
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capacitor - Audio input: stereo to mono and filtering DC - Electrical Engineering Stack Exchange
Stereo vs. Mono: What's The Difference?! - Home Studio Basics
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Is there a way to record a mono through a stereo input? - Quora
Simple Way to Convert Stereo to Mono : 5 Steps (with Pictures) - Instructables
Why are two 1 kΩ resistors used for this additive stereo to mono conversion? (For audio inputs to an amplifier) - Electrical Engineering Stack Exchange