Device: Denon DJ PRIME 4 G2 Firmware: Engine OS 5.1.1 Issue Type: Bug / STEM FX
Bug Description:
I discovered a bug in Engine OS 5.1.1 on my Denon DJ PRIME 4 G2.
When the “Hide Title/Artist” option is enabled under Settings → Device, the physical ACAPELLA and INSTRUMENTAL STEM FX buttons stop working.
Disabling “Hide Title/Artist” restores their normal functionality.
Steps to Reproduce:
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Open Settings → Device.
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Enable “Hide Title/Artist”.
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Load a track and try using the physical ACAPELLA or INSTRUMENTAL buttons.
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Notice that the buttons no longer function as expected.
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Disable “Hide Title/Artist”.
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The buttons work normally again.
Expected Behavior:
The ACAPELLA and INSTRUMENTAL STEM FX buttons should function normally regardless of whether “Hide Title/Artist” is enabled.
Actual Behavior:
Enabling “Hide Title/Artist” causes both physical STEM FX buttons to stop functioning.
Workaround:
Disable “Hide Title/Artist” in Settings → Device.
Additional Information:
This appears to be an unintended interaction between a display/privacy setting and the hardware STEM FX controls. These features should operate independently.