Yamaha Motif DDK-7 Owner's Manual page 30

Reference Page
2
Foot Pedal (page 196)
30 DDK-7 Owner's Manual
About the Solo function
The Lead Voice 2 section features an exclusive Solo function. Solo lets you
instantly switch to a solo Lead Voice in the middle of your performance, muting
all other Upper Keyboard Voices. If you connect an optional Foot Pedal to the
DDK-7, you can control the solo function without taking your hands from the
keyboards.
1 Select the Voice that you wish to play solo in the Lead Voice
2 section.
In this condition, all the Voices for Upper Keyboard (Upper Keyboard
Voice 1 and 2, and Lead Voice 1 and 2) can be played.
2 Press the [SOLO] button in the Lead Voice 2 section.
This sets Solo to standby status.
3
Press the [UTILITY] button to call up the Utility Display.
Press the [F. PEDAL] button at the top right of the display to call up the
FOOT PEDAL Page.