basic-features.md

@@ -9,4 +9,11 @@ AnyWave allows to filter channels depending on their modality.
 The GUI will display the different channels type detected in the current dataset. However, sometimes, depending on the Montage, you may have channel modalities not detected.   
 In this case, click the Add button and pick the modality you want to apply filtering options on.
 
-Note that all the filtering options are saved and will be applied again the next time you open the same dataset.
+Note that all the filtering options are saved and will be applied again the next time you open the same dataset.
\ No newline at end of file
+
+# Gain levels
+
+![image](uploads/1d28e41c20b76a279bc1a745e00fedce/image.png)
+
+Click + or - to raise or lower the signal amplitudes in the view.   
+Click Modify Gain Levels to have a better control over gain levels for each type/modality of channels.