# Sound input window

Source: https://help.malighting.com/grandMA2/en/help/key_ost_sound_input_window.html
This is grandocs, an unofficial mirror of MA Lighting documentation. For authoritative or safety-relevant information, cite the canonical page on help.malighting.com.

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To access the **Sound Input Window**, tap on an empty part of a screen. This must be at least 2 columns wide and 2 rows high. Tap System and then Sound Input.

This will open the **Sound Input Window**.

![](/img/grandma2/window_sound-input_v3_3-8ed5e7.png)

_Sound input window_

 

The window is divided in four sections.

## The upper left section

This section displays the different frequencies of the incoming signal. The first row is an overall summary. The next three rows splits the signal in **Bass**, **Medium** and **High** frequencies.

The seven last rows splits the signal in frequencies of 75 Hz to 3.7 KHz.

**Hint:**\
It is possible to assign the different frequencies to an **Effect**. Select the form **Sound** and a pop-up will display the possibilities. 

## The lower left section

This section displays the sound wave, received from the sound source.

## The upper right section

This section is a BMP (Beats per minute) counter. This section shows how the incoming sound is interpreted in BMP.

## The lower right section

This is the fader and button section. There are three faders:

- **Snd In** sets the gain of the incoming sound signal
- The **Snd Fade** fader is used with effects. When assigning one of the **Sound Forms** (form 20.x) to an effect, this fader will adjust how "hard" the effect will follow the sound. If **Snd Fade** is at 0 it will be hard and will smoothly fade up to be softer and softer, until the fader is set to 100. To read more about effects, see the [Effect](/grandma2/key_effects/) topic.
- The **BPM fader** will adjust itself to the BPM from the incoming sound signal.

Hint:\
These three faders can also be assigned to executor faders as **Special Masters**. To read more about Special Master, see the [Special Master](/grandma2/key_adv_exec_spec_master/) topic.

The three buttons to the right are responding to the BPM.

- DS will double the value of the BPM counter.
- Learn will allow you to tap the beat manually, and adjust the BPM to this level.
- HS will half the value of the BPM counter.