How to separate OBS audio: Chzzk and SOOP (Forest) broadcast recording track settings

The key to OBS audio separation is storing the entire mix for broadcast and individual tracks together for editing. To Chzzk or SOOP (Forest) viewers, you can send track 1, which contains both the microphone and game sounds, and leave the microphone and game sounds as separate tracks in the recording file.

Chzzk and SOOP (Forest) Standard for dividing tracks in audio settings

Chzzk audio setting and SOOP (Forest) audio setting do not involve sending multiple audio tracks separately to each platform. For broadcasting on both platforms, track 1, which contains both the microphone and game sound, is used, and tracks 2 and later are left for editing the recorded file after the broadcast is over. With this configuration, the platform receives the entire mix, and when editing, you can re-adjust the volume on a sound-by-sound basis.

Recommended track configuration

OBS' streaming settings allow you to select a single audio track, and recording settings allow you to select multiple tracks. Therefore, if you leave Track 1 empty, sound may be missing from broadcasts or general playback.

1. Receive microphone and app sound as separate sources

First, your microphone and game sounds should appear as separate items in the audio mixer.

• Windows: In OBS 28 and above, you can add ‘Application Audio Capture’. OBS 30.1 and higher also supports the option to receive app audio along with game capture or window capture.
• macOS: On macOS 13 and higher and OBS 30 and higher, you can add macOS Audio Capture and select a specific application.

If you receive separate sounds for each app, check that the desktop audio in ‘Settings → Audio’ is not receiving the same sound again. When two paths overlap, they can sound double, like an echo.

2. Turn on recording tracks 1 to 4

In ‘Settings → Output’, change the output method to ‘Advanced’ and open the ‘Recording’ tab.

1. Select Matroska Video (.mkv) as the recording format.
2. Check audio tracks 1, 2, 3, and 4.
3. Press ‘Apply’.

OBS recommends MKV as it is less likely to cause complete file corruption if recording is suddenly stopped. If you need MP4, you can convert it from ‘File → Record Remux’ after recording.

3. Determine the track for each source

Open ‘Audio Advanced Settings’ under Audio Mixer. You can check it like this:

• Mike: Tracks 1 and 2
• Game or App Sounds: Tracks 1 and 3
• Discord: Tracks 1 and 4

The point is to check all sources on track 1, and leave only the relevant sources on track 2 and beyond. If you check all tracks in all sources, the content will be the same even if there are multiple tracks in the file.

4. Check the actual track by recording briefly

Before broadcasting, record about 10 seconds and check the audio track in an editing program. The MKV I tested with the settings in this article produced one video and four AAC audio.

Regular video players often play only one audio track rather than mixing multiple audio tracks simultaneously. Even if the playback sound is normal, you should double check that tracks 2, 3, and 4 are separated in the editing program.

If you have not yet set up everything from Chizizik and SOOP's server and stream key connection to resolution and bitrate, please check the OBS Chizizik and SOOP Broadcast Setting Guide] first. Splitting audio is the process of adding a recording track for editing to its basic settings.

The verification date is August 3, 2026, and the actual settings and number of audio streams in the recorded files were confirmed in OBS Studio 32.2.1 and macOS environment.

Frequently Asked Questions

Do I need to set up Chzzk and SOOP (Forest) audio settings separately?

If you include both the microphone and game sound on Track 1 for your broadcast, your viewers will receive normal overall sound. Separate tracks are used for editing local recording files.

Why do I only hear one sound when I play a recorded file?

Regular video players often play only one audio track among many. Put all the sounds on track 1 as well, and check after track 2 in your editing program.

Why do I hear the game sound twice in OBS?

It's likely that your global desktop audio and per-app audio capture are receiving the same sound at the same time. If you use app-specific capture, turn off redundant global devices.

Is MKV a better recording format than MP4?

OBS recommends MKV, which has a low risk of damaging the entire file even if recording ends abnormally. If you need MP4, you can record it and then convert it with OBS' Remux Recording feature.

Source

• OBS Multiple Audio Track Recording Guide
• OBS Application Audio Capture Guide
• OBS macOS Desktop Audio Capture Guide
• OBS Audio Source Guide
• OBS standard recording output guide