Справочник Пользователя для Roland KR7/5

Normally, when using Automatic Accompaniment in a performance, sounds are not 

produced by playing the left-hand part of the keyboard. When you touch the 

<Lower> icon, you can have Tones from the left side of the keyboard play 

simultaneously with the Automatic Accompaniment.

This sets the Automatic Accompaniment.

Now when you play a chord in the left-hand keyboard area, the notes you play will 

sound, and the accompaniment chord changes.

fig.d-lower.eps_60

The <Lower> icon reverts to black, and the left-hand Tones stop playing.