以立体声方式（左或右）平移正在播放的声音。这仅适用于单声道或立体声声音。
此平移是在考虑 3D 平移计算之前应用的。换句话说，立体声平移会影响声音在 3D 空间化之前的左右平衡。
单声道声音使用恒定功率平移（非线性衰减）从左到右平移。这意味着当 pan = 0.0 时，声音在每个扬声器中的平衡是 71% 左和 71% 右，而不是 50% 左和 50% 右。这提供了（听觉上）更平滑的平移。
立体声声音会根据指定的平移位置使每个左右值上下衰减。这意味着当 pan = 0.0 时，声音在每个扬声器中的平衡是 100% 左和 100% 右。当 pan = -1.0 时，只有立体声声音的左声道可听，当 pan = 1.0 时，只有立体声声音的右声道可听。
值范围从 -1.0 到 1.0。
-1.0 = 全左 0.0 = 中间 1.0 = 全右
默认值 = 0.0。
no example available in C#
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