When Spark GO is connected to your computer as a USB audio device, its physical volume controls do not affect USB playback. Instead, you adjust playback volume from the computer - either per-app or through the OS volume mixer.
Set Up Spark GO as USB Audio
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With Spark GO powered off, connect it to your computer using the included USB cable.
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Turn on Spark GO.
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On your computer, select Spark GO USB Audio as the recording / playback device.
Adjust Playback Volume on the Computer
macOS
Use the built-in volume control from the application itself (e.g. YouTube, Spotify, Apple Music).
Windows
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Open Settings → System → Sound.
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Under Advanced, click Volume mixer.
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In the Apps list, adjust the volume slider for each app individually (e.g. Chrome, Spotify, Media Player).
Adjust Guitar Monitoring
Use the Guitar Volume knob on Spark GO to adjust the direct monitoring level of your guitar. This is independent of the computer's playback volume.