Test Sound Gain - Test Sounds can be triggered by tapping here, or by hitting the Q, W, E, or R keys on your keyboard.'auto' fires the last played test sound after each impulse response and preset switch, and after each parameter adjustment.
Test Sounds give you some feedback while selecting rooms, or when making parameter adjustments. The test sounds used are wav files located in

/Library/Application Support/Audio Ease/Altiverb/Altiverb_resources/Trigger_Presets

You can put your own preferred samples there. The gain knob sets overal gain for the test sounds.

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