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If you mean using an external microphone, mixer, or USB audio source in your live program, Larix Broadcaster for Android supports a USB OTG route—but Softvelum describes it as experimental, so you must test your exact phone and device. The documented method sends that audio as the program’s sound; a separate viewer-selectable alternate audio track is not documented in the official Larix and YouTube materials reviewed.
What “external audio track” means here
In a live-streaming setup, “external audio” can mean routing a sound source—such as a microphone or mixer—into the audio that viewers hear. Larix’s documented Android USB OTG method is for this use. Softvelum says UVC OTG USB devices can be used as video and audio sources, and identifies the feature as experimental.
A different feature would send multiple separate audio tracks so viewers could choose between them during playback. The official Larix and YouTube materials reviewed do not document that workflow. Do not assume that connecting a USB source creates a selectable alternate track.
Before you connect anything
- Use an Android device running Android 7.0 or later, the minimum listed in Softvelum’s Larix Broadcaster for Android documentation.
- Check that the phone supports USB host/OTG and that the specific USB device supports audio capture with that phone. A USB-C OTG adapter may be needed, depending on the phone’s connector; an adapter alone does not guarantee compatibility.
- Confirm the source’s output is suitable for the device’s input. In particular, check whether the source is a microphone-level or line-level signal and whether you need multiple simultaneous inputs.
- Consider power needs and how the phone, adapter, and audio device will be powered during the stream.
Softvelum warns that some phone-and-device combinations may not work properly. Compatibility depends on the handset, Android version, Larix version, and connected hardware; verify the exact combination before an event.
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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.
Set up the USB audio input in Larix
- Connect the hardware path. Attach the USB audio device to the Android phone, using a compatible OTG adapter if required. Follow the audio device’s own connection and power instructions.
- Enable USB support. In Larix Broadcaster, open Advanced settings → USB Camera and enable the feature.
- Restart Larix. Softvelum’s documented setup calls for restarting the app after enabling USB Camera.
- Initialize the device if needed. Softvelum notes that tapping the camera ON/OFF control may be necessary to initialize the USB camera. The wording refers to the camera control; available controls and routing behavior can vary by device and app version. Do not expect a universal audio-source selector that is not shown for your setup.
- Confirm input before streaming publicly. Check Larix’s audio meter or source behavior, then run a private or unlisted test where appropriate and verify the sound in YouTube’s preview.
Connect Larix to YouTube Live
- Open YouTube Studio and enter the Live Control Room. If live streaming has not previously been enabled on the channel, YouTube says first-time activation may take up to 24 hours; that is an activation delay, not a delay caused by external audio setup.
- Copy the stream URL and stream key provided by the Live Control Room into Larix’s connection settings. Use the URL supplied for your stream rather than assuming a fixed endpoint.
- When Larix supports it, use the RTMPS URL supplied by YouTube. RTMPS adds TLS encryption. Treat the stream key like a password: keep it private and reset it in YouTube if it is exposed.
- Start with a private or unlisted test if that suits your event, and wait for YouTube’s preview to show the incoming stream before going public.
YouTube’s encoder workflow supports external audio and video hardware. The RTMP(S) destination and key come from the Live Control Room; Larix publishes the stream to that destination.
Check the audio before the event
Larix documents AAC audio encoding on Android outside WebRTC. For standard live ingestion, YouTube lists AAC or MP3 audio and recommends 128 Kbps for stereo. Use the Live Control Room preview as the final check that the encoded sound is arriving cleanly.
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.
- Listen for silence, clipping or distortion, hum, and unexpected background noise.
- Check left and right channels separately if the source or mixer uses stereo; confirm that speech or other important sound is not missing from one side.
- Make a short test recording or private stream long enough to check the complete signal path, including any mixer, adapter, and USB device.
- Recheck the setup after reconnecting hardware or changing app, Android, or device settings.
Troubleshoot missing or poor audio
| Symptom | What to check | What to try |
|---|---|---|
| No audio reaches Larix or YouTube | USB host/OTG support, the adapter and cable, Android USB permissions, device power, and whether the device can provide audio capture to this phone. | Reseat the adapter and device; check Android permissions and host support; restart Larix after enabling USB Camera; try the camera ON/OFF initialization Softvelum describes. Test the same cable and source chain outside the event if possible. |
| The USB device connects, but Larix does not use it as expected | Whether the particular combination is supported and whether the expected controls exist in that Larix and Android version. | Confirm the setup against Softvelum’s USB OTG instructions. Because support is experimental, test another known-compatible device path rather than assuming a universal selector or guaranteed input behavior. |
| Sound is distorted, too quiet, or noisy | Source level, mixer output, cabling, power, and whether the connection is appropriate for microphone or line-level audio. | Adjust levels at the source or mixer and check the full chain in a test stream. Avoid raising a noisy signal excessively at the phone end. |
| One stereo channel is silent or unbalanced | Source routing, stereo cable connections, and the audio device’s channel configuration. | Check the left/right outputs and monitor both channels in YouTube’s preview before the live event. |
| YouTube does not receive the stream | The stream URL and key copied from the current Live Control Room session, and whether live streaming has been activated for the channel. | Re-enter the current URL and key in Larix, use the supplied RTMPS URL if supported, and check the Live Control Room status. If this is the channel’s first live stream, allow for YouTube’s stated activation period of up to 24 hours. |
Or let it run in the cloud
If the goal is to keep uploaded videos looping as a YouTube live stream, rather than stream a live microphone or mixer feed from your phone, StreamNeo is a cloud option. Upload a recording or build a playlist, add your YouTube stream key, and go live. The computer and home connection do not have to stay on. StreamNeo plays uploaded videos; it does not broadcast a live camera or accept this Larix external-audio setup as a camera feed.
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
- No computer or phone has to stay on at home: playback runs from the cloud.
- Each slot streams your upload as made, up to 4K 60fps, at one flat price per slot, without re-encoding or quality tiers.
- StreamNeo automatically recovers if YouTube drops the stream.
- The first day is free with no card required, one free day per account. Monthly billing is $9.99 per month.
Start your free StreamNeo day.
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.
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