Roland AIRA Compact E-4 Voice Tweaker - Manual (Page 6)

Configuring the Mic Input (MIC IN)
6
Configuring the Mic Input (MIC IN)
Preventing accidental sounds (LOW CUT FILTER)
1. Move the [REVERB] slider while holding down the [AUTO PITCH] button.
Value Explanation
10
,
25
,
50
,
100
Sets the cutoff frequency of the low cut filter.