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How to Use Audio Input with RecDual Dongle?

RecDual Dongle features an AUX port that serves dual purposes: microphone input for commentary and headphone output for audio monitoring.

AUX Port Overview

Specifications:

  • Connector: 3.5mm TRRS (4-pole) jack

  • Functions: Microphone input OR line output

  • Compatibility: Standard headsets with microphone

Dual Function:

  • As Input: Connect external microphone for voice commentary

  • As Output: Connect headphones for audio monitoring

Using as Microphone Input

Add voice commentary to your recordings:

Compatible Microphones:

  • Lavalier (clip-on) microphones with 3.5mm plug

  • Headsets with built-in microphone

  • External microphones with 3.5mm output

Setup Steps:

  1. Connect microphone to the AUX port

  2. Set up your video source connection (HDMI or Type-C DP)

  3. Start recording as normal

  4. Speak into the microphone

Audio Mixing:

  • Microphone audio is mixed with source audio

  • Both tracks are combined in the final recording

  • There is no separate audio track option

Use Cases:

  • Game commentary and streaming

  • Tutorial narration

  • Presentation voiceovers

  • Interview recording

Using as Headphone Output

Monitor audio during recording:

Why Use Headphone Output?

When recording from Type-C DP sources:

  • The source device’s speaker is disabled

  • You cannot hear audio from the device directly

  • Connect headphones to AUX to hear the audio

Setup Steps:

  1. Connect headphones to the AUX port

  2. Connect your Type-C DP source

  3. Audio will play through the headphones

Alternative: HDMI Passthrough

  • Connect HDMI OUT to a TV

  • Audio plays through TV speakers

  • Useful when you prefer speakers over headphones

Using a Headset (Both Functions)

A headset with microphone can provide both functions:

Benefits:

  • Monitor audio through headphones

  • Add voice commentary through microphone

  • Single device solution

Requirements:

  • TRRS (4-pole) 3.5mm plug

  • Standard smartphone-style headset works

Setup:

  1. Connect headset to AUX port

  2. Headphone speakers output source audio

  3. Headset microphone captures your voice

  4. Both are mixed in the recording

Tips for Best Audio Quality

For Microphone Recording:

  1. Use a quality external microphone for better clarity

  2. Position microphone at appropriate distance

  3. Minimize background noise

  4. Test audio levels before important recordings

For Headphone Monitoring:

  1. Use comfortable headphones for long sessions

  2. Set appropriate volume level

  3. Ensure headphones are securely connected

General Tips:

  • Check that AUX cable is fully inserted

  • Use cables in good condition

  • Avoid cables with poor shielding (may cause interference)

Limitations

  • Only one function at a time with single-port devices

  • No separate audio level controls on device

  • Cannot adjust microphone gain independently

  • Audio mixing is automatic, no manual control

Troubleshooting

No Microphone Audio in Recording:

  • Ensure microphone is fully inserted

  • Check if microphone has on/off switch

  • Try a different microphone

No Audio in Headphones:

  • Verify headphone connection

  • Check if source device has audio output

  • Ensure volume is not muted on source

Audio Quality Issues:

  • Try a different cable/microphone

  • Check for loose connections

  • Ensure cable is TRRS (4-pole) compatible

Related articles:

Audio Capabilities of RecDual Dongle How to Use AUX Input for Microphone Recording? Why is There No Sound When Recording from My Phone?