Sony GP-X1EM Grip Extension - Manual (Page 84)

84
Combining a background and key
You can simultaneously insert and remove keys when
switching the background.
Key 1
Insert Remove
Key 2
Key 2
Key 1
Transition
Simultaneously inserting and removing keys
Key 1
Transition
Key 2
Inserting key when switching the background
Key 1
Transition
Key 3
Key 2
Key 4
Inserting and removing keys when switching the background