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If you mean using an external microphone, mixer, or USB audio source in your YouTube broadcast, Larix Broadcaster for Android documents an experimental USB OTG route. Enable Advanced settings → USB Camera, restart Larix, connect a compatible device, and test the result before going live. This puts the sound into the program audio; the official materials reviewed do not document a separate viewer-selectable audio track.
What “external audio track” means here
An external source such as a microphone or mixer can feed audio into the live program, alongside its video. That is different from sending multiple audio tracks that viewers can select independently while watching. The Larix and YouTube documentation covered here describes the former workflow, not the latter.
Softvelum says its Android app can use “UVC OTG USB devices” as video and audio sources, but labels this support experimental. Whether it works depends on the particular Android phone and USB device.
What you need before setup
- An Android phone running Android 7.0 or later, the minimum listed in Softvelum’s Larix Broadcaster for Android overview.
- Larix Broadcaster and a USB OTG-compatible audio/video device. Depending on the phone connector, you may also need a USB-C OTG adapter. An adapter by itself does not guarantee compatibility: verify USB host and audio-capture support for the exact phone and device.
- A YouTube channel with live streaming enabled, plus access to YouTube Studio’s Live Control Room to obtain the stream URL and key.
- Time for a private or unlisted test. YouTube says first-time live-stream activation can take up to 24 hours; that is activation timing, not a requirement of the audio setup.
Connect an external USB audio source in Larix
- Check the source and connection. Confirm that the phone supports USB host/OTG and that the connected device supports audio capture with Android. Check whether the source provides microphone-level or line-level audio, how many simultaneous inputs you need, and whether the device requires its own power. Compatibility can vary by handset, Android version, manufacturer, Larix version, and USB hardware.
- Enable USB Camera in Larix. Open Larix Broadcaster and go to Advanced settings → USB Camera. Enable the feature, then restart the app. Softvelum’s USB OTG instructions describe this as experimental support. The app may need you to tap its camera ON/OFF control to initialize the USB device.
- Get the YouTube encoder details. In YouTube Studio, open the Live Control Room and create or select the stream. Copy the stream URL and stream key provided there. Use the RTMPS URL when Larix supports it; RTMPS encrypts the connection. Use the URL supplied by YouTube rather than assuming an endpoint.
- Enter the connection in Larix. Add the Live Control Room URL and key in Larix’s connection settings, taking care not to expose the key. Larix supports RTMP publishing, as noted in Softvelum’s Android overview. YouTube’s encoder setup guidance covers connecting an encoder using its stream details.
- Run a test broadcast. If appropriate, set the YouTube stream to private or unlisted, start Larix, and check that the USB source is active. Confirm that audio reaches the Live Control Room preview, then listen for silence, clipping, hum, distortion, and missing left or right channels before starting the actual event.
Audio settings and what to verify
Softvelum says Larix encodes Android audio as AAC outside WebRTC. YouTube’s live encoder specifications accept AAC or MP3 audio and recommend 128 Kbps for stereo. These are platform encoding details, not a guarantee that a particular USB source is selected or routed correctly by every phone.
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#1 Best Overall
USB-C & USB-A Lavalier Microphone for Smartphones & Computers, 6.6 ft
- USB-C & USB-A COMPATIBILITY - This lavalier microphone for type c devices is compatible with iPhone 15/16/17 Series, MacBook Pro, Mac mini, Samsung Galaxy S24/23, and other smartphones or tablets with a USB C jack. Comes with a USB-C to USB-A adapter, it also works well with most laptop and desktop PCs, Mac, and other computers.
- CLEAR SOUND QUALITY - Built with a premium sound card (24-bit / 96kHz), this omnidirectional condenser microphone captures your voice with clarity and accuracy, while reducing unwanted background noise — ideal for interviewing, online conferencing, podcasting, vlogging, live streaming.
- PLUG & PLAY LAPEL MIC - This USB C lavalier microphone with USB-A connection is play-and-play, no extra cables or set-up. Just plug it into your device with USB-C or USB-A, it'll start working instantly. Without drivers and battery needed, it is friendly-design and easy to use.
- FLEXIBLE CLIP & 6.6FT CABLE - Featuring a sturdy metal clip, this USB-C lapel microphone can be securely attached to your clothing for optimal placement or discreet use. The 6.6FT / 2M soft silicone cable provides ample length and flexibility for comfortable movement during recording.
- ALL-IN-ONE PACKAGE & SUPPORT- Includes a USB-C microphone with clip and windscreen, cable tie, USB-C to USB-A adapter, and a premium storage pouch. Comes with 1-year protection and 24-hour customer support.
Check the actual YouTube preview rather than relying only on a connected-device indicator in Android or Larix. A device can appear connected while its audio is silent, too quiet, distorted, or routed differently than expected.
Troubleshooting: no sound or unusable sound
- No USB source appears or there is silence: Re-seat the USB device and adapter, check that the phone supports USB host/OTG and audio capture, and respond to any Android USB permission prompt. After enabling USB Camera, restart Larix. Try toggling the camera ON/OFF control to initialize the device.
- The source connects but the YouTube preview is silent: Confirm the source itself is producing audio and that the cable, mixer output, and device power are correct. Check Larix’s source behavior and YouTube’s preview; the exact routing controls may vary by app version and hardware.
- Audio clips, hums, or distorts: Check the source’s output level and the connection chain, especially if connecting a line-level mixer output to equipment expecting a microphone-level signal. Test outside the event and adjust the source before streaming.
- Only one side of stereo is audible: Check the cable and source output, then verify both channels in the YouTube preview. The documented general OTG path does not establish a universal channel-routing control.
- YouTube does not receive the stream: Recheck the Live Control Room URL and key, and confirm that the key was entered correctly in Larix. Use YouTube’s supplied RTMPS URL when supported. Keep the key private.
- Your particular phone and USB device still do not work: Softvelum warns that some combinations may not work properly because USB OTG support is experimental. Test the exact handset, Android version, Larix version, adapter, and audio device together before relying on them for a live event.
Copyright and documentary-stream checks
Using an external input does not change the rights obligations for the material in a YouTube stream. Before broadcasting recorded documentary footage, music, narration, or other third-party material, make sure you have the necessary rights or permissions. Keep in mind that a successful technical test does not establish that content is cleared for broadcast.
Rank #2
ZealSound Podcast Microphone for PC, Noise Cancellation USB Mic with Gain, Volume Adjustment & Mute Button, Monitoring & Echo, for YouTube, TikTok, Podcasting, Streaming, iPhone, iPad, Android, Mac
- Studio-Quality Sound for Clear Podcast Recording – The K66 USB podcast microphone delivers studio-quality, broadcast-level audio using a high-performance condenser capsule and cardioid pickup pattern that focuses on your voice while reducing unwanted background noise. Designed as a reliable microphone for PC, it features a wide 40Hz–18kHz frequency response and a 46kHz sampling rate to reproduce rich lows, smooth mids, and clear highs for natural, detailed vocals. With –45dB ±3dB sensitivity, it captures balanced sound without distortion during expressive speaking. Ideal for podcasting, voice-over, online classes, meetings, and professional content creation.
- Intelligent Noise Reduction Mode for Cleaner Podcast Audio – This podcast microphone features an advanced Noise Reduction Mode designed for clearer, more focused voice recording in real-world environments. Press and hold the mute button to enable noise reduction (blue indicator). In this mode, the microphone helps reduce keyboard clicks, PC fan noise, air conditioner hum, and background chatter. Default Mode maintains a warm, natural vocal tone for quiet spaces. Designed as a reliable microphone for PC, it allows creators to identify the active mode instantly and adapt as needed, ensuring clear audio for podcasting, gaming, streaming, online classes, meetings, and recording.
- True Plug-and-Play USB Microphone with Wide Device Compatibility – Engineered for effortless plug-and-play use, the K66 USB microphone requires no drivers, apps, or software installation. Simply connect and start recording on Windows PC, Mac, laptops, PS4, PS5, and tablets. Included USB-C and Lightning adapters ensure seamless compatibility with iPhone, iPad, and modern USB-C phones and devices, making it easy to switch between desktop and mobile recording. Ideal for creators working across multiple platforms, this microphone delivers consistent, high-quality audio for YouTube, TikTok, Twitch, Zoom, Discord, OBS Studio, Streamlabs, podcasting, livestreaming, and professional voice recording.
- Real-Time Zero-Latency Monitoring with Adjustable Volume Control – This podcast microphone features real-time, zero-latency monitoring through a built-in 3.5mm headphone jack, allowing you to hear exactly what’s being recorded without delay. Designed as a reliable microphone for PC, it includes a dedicated monitoring volume control that lets you adjust headphone listening levels independently for accurate and comfortable audio monitoring. Real-time feedback helps identify distortion, background noise, or uneven volume before it affects your final recording, making this podcast microphone ideal for podcasting, streaming, online teaching, voice-over work, and professional content creation.
- Precision Audio Adjustment Knobs for Full Sound Control – This podcast microphone gives creators hands-on control with dedicated knobs for microphone volume, monitoring volume, and echo adjustment. Fine-tune mic gain to maintain clear, balanced vocal output, adjust headphone monitoring levels independently for comfortable listening, and add or reduce echo to enhance depth and presence. Designed as a reliable PC microphone, these intuitive physical controls allow fast, on-the-fly adjustments without software, helping identify distortion, background noise, or level inconsistencies instantly. Ideal for podcasting, streaming, ASMR, voice-overs, singing, and professional multi-platform recording.
Or let it run in the cloud
For a pre-recorded program that should stay live on YouTube, StreamNeo is a different workflow from Larix: upload the video, add your YouTube stream key, and go live. It loops uploaded videos from the cloud; it is not a camera-input or external-microphone solution.
- Nothing has to stay on at home: the stream continues from the cloud with your computer off.
- Any quality up to 4K 60fps at one flat price per slot; the uploaded video streams as made, without re-encoding or quality tiers.
- Automatic recovery if YouTube drops the stream.
- The first day is free with no card; one free day per account.
The monthly option is $9.99 per month. See StreamNeo for details, then start your free day.
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Quick Recap
SaleBestseller No. 3
Bestseller No. 5
Best Value
DUNGZDUZ USB C Mini Microphone for Mac mini Pro Studio M4/M5/M6
- SPECIALLY DESIGNED FOR MAC MINI – This small USB-C microphone is designed for Mac mini Pro Studio M4/M5/M6 and MacBook. Once Siri is enabled and the mic is set as your input device, you can wake Siri instantly for hands-free convenience.
- PLUG & PLAY – No extra software, drivers, or complicated setup required. Simply plug the microphone into your Mac mini and it’s instantly ready to use, perfect for video call, voice dictation, or online classes.
- CLEAR AUDIO SOUND – Equipped with a high-sensitivity condenser capsule and premium audio chipset, this mini microphone accurately captures your voice while reducing unwanted background noise, delivering crystal-clear audio for both work and study.
- COMPACT & PORTABLE – With its ultra-compact size, this microphone takes up almost no space on your desk and keeps your setup neat. It comes with a durable metal carrying case, making it easy to take anywhere for work, travel, or study on the go.
- WHAT YOU GET – 1 × USB-C Mini Microphone with a metal carrying case, backed by a 12-month warranty. Our support team is always ready to help you whenever needed.
Rank #4
Sennheiser Pro Audio Condenser Microphone, XS Lav USB-C (509261),Black
- Ideal for content creation and video conferencing that require a simple, high-quality set-up
- Omnidirectional microphone capsule provides clear, natural sound
- Included accessories: mic clip, windscreen and storage pouch
- Cable length of 2 m (6.6’)
- Also available: XS Lav USB-C Mobile Kit (includes Manfrotto PIXI Mini Tripod and Sennheiser Smartphone Clamp)
Rank #3
Sale
AKG Pro Audio Ara Professional USB-C Condenser Microphone, Dual Pattern Audio Capture Modes for Podcasting, Video Blogging, Gaming and Streaming, Blue & Silver
- Pro-Grade, High-Quality Sound: 24-bit/96kHz High-resolution audio
- Two Audio Capture Modes: Dual-capsule mic array provides two user-friendly capture modes
- Easy Setup and Universal Compatibility: Intuitive, plug-and-play setup and operation with support for Mac and PC, plus iOS and Android tablets and phones
- Headphone Output and Volume Control: Zero latency monitoring while tracking with full control over output volume, mic gain and mute
- Versatile Mounting Options: Can be used with the integrated base stand, with a desktop boom arm, or a common microphone stand
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
