Comment 0 for bug 1432082

Users who do not use an external mixer do not need to set outputs for each deck. Always displaying the interface to set those outputs in the preferences is confusing because it implies to new users that they should be set (I remember myself being confused about that when I first opened Mixxx). Also, the Sound Hardware section of the preferences dialogue is growing large vertically. A solution to both these problems could be a checkbox for "Use external mixer" above the Master output configuration that would show the deck 1-4 settings.

What are the new left/center/right bus settings for? Should those be hideable as well?