I swear everything about this makes perfect sense and serves a purpose.pic.twitter.com/GWAhaoeSig
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So Behringer makes this nifty set of digital wireless mics with a USB dongle form factor receiver. Sadly, the Switch does not like it (probably because it only supports 48kHz 24bit stereo mode).
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However, it has an undocumented analog mode, which uses the SuperSpeed pins on a USB 3.0 Type A connector (even though this isn't 3.0) for analog audio and status, to work with some Behringer mixers. So I broke it out to minijack stereo (two mics, two channels).
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So I use a more typical USB sound card with the Switch instead. But when the switch detects a USB device with audio *output* capabilities, it unconditionally sends system audio to there instead of HDMI. So I need RCA out to my sound system, instead of using the HDMI audio.
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And then the Switch Joysound karaoke app only takes mic input from the left channel of USB audio devices, so I need to mix down stereo 3.5mm TRS to mono 3.5mm TS. Then I need a 3.5mm gender changer, RCA converter, and short RCA cable to plug it into the USB interface.
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Now the long-term Right Way to fix this would be to reflash the Behringer dongle's USB frontend microcontroller to hand out USB audio descriptors that the Switch does like, but that's going on the longer-term project stack. This I cooked up in 15 minutes.
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And besides I wanted to be able to use the Behringer dongle as a generic analog-output wireless mic receiver anyway. Works well when powered with a USB mobile battery, gives you clean 3.5mm stereo line out.
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and you provide power from the switch?
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Exactly. In fact I snipped the 2.0 D+/D- lines, because if those are connected the receiver switches to digital USB mode and shuts down the analog output.
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How does it behave if you plug it into a female USB 3.0 jack, where those pins actually connect?
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It works as USB 2.0. USB 3.0 isn't going to exactly think that some analog audio is a proper SuperSpeed negotiation, and as soon as USB 2.0 negotiation starts it shuts down the audio/status output anyway.
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These the ULM200's? I was looking at those for a thing, and had no idea analog output was possible for them; might make them perfect for what I need.
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Yup. The fact that they have analog output is documented ("Ultra-compact USB receiver with dual mode analog/digital audio interface"), but not how it works. It's intended for their mixers with a dedicated port for this.
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