JetAudio iAUDIO U2 - Manual (Page 29)

iAUDIO U2
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5. 3D Surround:
3D Surround
Level 5
Pan
Level 0
3D Surround creates an authentic and exciting 3D effect.
You can turn this off or select a level between 1 and 10.
Pan is the feature to adjust the balance between left and right sound
volumes.
You can select a level between -20 and +20 from left to right.
6. Pan (L/R Balance)
Advanced Operations
JetEffect