You can have as many audio strips as you wish and the result will be the mixing of all of them. You can give each strip a separate name and Gain (in dB) via the N menu. This also lets you set a strip to mute or 'Pan' it; -1 is hard left, +1 is hard right, with percentages in between.

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Overlapping strips are automatically mixed down during ANIM processing. For example, you can have the announcer on Channel 5, background music on Channel 6, and Foley sound effects on Channel 7. Refer to Figure 5.