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If you mean using an external microphone, mixer, or USB audio source, Larix Broadcaster for Android documents an experimental USB OTG route. Enable it under Advanced settings → USB Camera, restart the app, connect a compatible device, and test the result in YouTube’s preview before going live. If you mean a separate audio track viewers can choose during playback, the official Larix and YouTube materials reviewed do not document that capability.
What “external audio track” means here
This setup sends audio from an external source into the stream’s program audio. It does not establish separate audio tracks that viewers can switch between. Softvelum says compatible UVC OTG USB devices can be used as video and audio sources, but identifies the feature as experimental. See Softvelum’s Android USB OTG instructions.
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Larix Broadcaster for Android supports RTMP publishing and AAC audio. Softvelum lists Android 7.0 and up as the minimum operating-system requirement; device and feature behavior can still vary by phone, Android version, Larix version, and connected USB hardware. See Softvelum’s Larix for Android overview.
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Check your phone and audio hardware first
Before buying an interface or setting up an event, verify the complete connection chain for your exact handset and USB device. Android USB host support alone does not guarantee that a particular interface’s audio will work in Larix.
#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.
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- Confirm the phone supports USB host/OTG and that the USB device is compatible with Android audio capture.
- If the phone has USB-C and the device uses another connector, use an appropriate OTG adapter. An adapter by itself does not make an incompatible audio device work.
- Check whether the source is a microphone-level or line-level output and whether the device provides the inputs you need.
- Check power needs, especially if the USB audio device must be powered separately or draws more power than the phone can supply.
- If you need more than one simultaneous input, confirm the interface and its Android routing support those inputs; the general Larix OTG documentation does not establish a universal multi-input selector.
Enable the USB input in Larix
- Install and open Larix Broadcaster on the Android phone. The documented minimum is Android 7.0 and up.
- Open Advanced settings → USB Camera and enable the feature.
- Restart Larix after enabling USB Camera.
- Connect the compatible USB OTG audio/video device. Softvelum notes that it may be necessary to tap the camera ON/OFF control to initialize the USB camera.
The menu and initialization behavior are the documented route, not a promise that every device will expose the same controls or work correctly. Softvelum describes USB OTG support as experimental, and warns that some phone/device combinations may not work properly.
Connect Larix to YouTube Live
- In YouTube Studio, open the Live Control Room and create or select the stream you intend to use.
- Copy the stream URL and stream key shown there. Use the RTMPS URL when Larix supports it and YouTube provides it for your stream. YouTube’s instructions are at Set up your encoder for live streaming and Stream using an encoder.
- In Larix, add or edit the connection using the URL and key from Live Control Room. Do not assume a fixed ingest endpoint; use the values YouTube supplies.
- Keep the stream key private. Anyone with access to it may be able to send a stream to your channel.
RTMPS adds TLS encryption to the connection. YouTube recommends using its RTMPS ingest option when supported; follow the URL and key shown for the stream rather than substituting an endpoint from another setup.
Rank #2
Sale
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.
Test the audio before the event
- Start with an unlisted or private test stream if that suits your channel and event.
- Check that the external source is connected and active in Larix. If the sound is silent, verify the hardware path before changing unrelated YouTube settings.
- Open the YouTube Live Control Room preview and confirm that audio is arriving there.
- Listen for clipping, silence, hum, and missing or imbalanced left/right audio. Adjust the source or interface gain if needed, then test again.
- Only rely on the setup for the event after the complete phone, interface, cable, Larix, and YouTube path has passed a test.
YouTube’s standard live-ingestion guidance lists AAC or MP3 audio and recommends 128 Kbps for stereo. Larix documents AAC audio encoding on Android outside WebRTC. The YouTube preview is the practical final check that the encoder output is arriving cleanly. See YouTube’s live encoder settings.
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Troubleshoot common failures
| Symptom | Likely cause | What to try |
|---|---|---|
| Larix does not detect or initialize the USB device | OTG/host support, adapter, permissions, or device compatibility issue | Re-seat the adapter and device, verify USB host support and Android permissions, restart Larix after enabling USB Camera, and try toggling the camera ON/OFF to initialize it. |
| Video works but there is no external audio | The connected device may not expose compatible Android audio capture, or the source/input path may be inactive | Check the interface input, source connection, gain, and compatibility for the exact handset and device. Test the cable and source chain outside the event if possible. |
| Audio is present in Larix but absent in YouTube preview | The encoder connection or outgoing audio may not be reaching the selected YouTube stream | Confirm Larix is publishing to the URL and key shown in the correct Live Control Room session, then check the preview again. |
| Audio clips, hums, or sounds uneven between channels | Source gain, cabling, or left/right routing may be unsuitable | Inspect the mixer/interface output and cable path, lower excessive input gain, and run another private or unlisted test. |
| You cannot find a menu matching these steps | Controls can vary with Larix version, Android version, handset, and connected device | Check the installed version’s settings and Softvelum’s current USB OTG instructions; do not assume a universal input-selector menu. |
Or let it run in the cloud
If your goal is to keep uploaded video running on YouTube 24/7 rather than broadcast a live microphone or mixer, StreamNeo is a different workflow: upload a recording or build a playlist, add your YouTube stream key, and go live. It plays uploaded videos, not a live camera or external audio input.
Quick Recap
SaleBestseller No. 3
Bestseller No. 5
Best Value
DUNGZDUZ USB C Mini Microphone for Mac mini Pro Studio M4/M5/M6
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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
- Nothing has to stay on at home; the stream runs from the cloud.
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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.
