What is the function of all the motherboard audio ports? - Quora
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C-MEDIA CM6206 5.1 USB Audio Sound Card Line-In & Line-Out Bass Extension Low Frequency Response Upgrade - TehnoBlog.org
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Amazon.com: Headset Buddy Line-Level Audio Adapter with Built in Attenuation for iPhone, Smartphones, Soundboards and Mixers (iPhone-Mic-Line) : Electronics
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Pimoroni Pirate Audio: 3.5mm Line-out for Raspberry Pi : ID 4452 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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I have a male-to-male audio cable (a 3.5mm jack on each end). Can it be used to play music from my iPod or smartphone on a PC? If so, how? - Quora
Pipe/Mix Line In to Output in PulseAudio - Unix & Linux Stack Exchange