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Implement "Set warning-bell volume (DECSWBV), VT520."
Implement this VT sequence.
CSI Ps SP t
Set warning-bell volume (DECSWBV), VT520.
Ps = 0 or 1 -> off.
Ps = 2 , 3 or 4 -> low.
Ps = 5 , 6 , 7 , or 8 -> high.