Once you get to the Channels display from double tapping Volts, check the response of both sticks in both directions with the Rate slider at Turtle and at Rabbit.
Throttle (CH01) should be near 0% at full down and 100% full up in Rabbit and 20% full down and 80% full up in Turtle. At neutral it should be 50%.
Pitch (CH03) and Roll (CH02) on the right stick should be -80% to +80% in Turtle and -100% to +100% in Rabbit.
Yaw (CH04) should be near +/-50% in Turtle and +/-80% in Rabbit.
Throttle (CH01) should be near 0% at full down and 100% full up in Rabbit and 20% full down and 80% full up in Turtle. At neutral it should be 50%.
Pitch (CH03) and Roll (CH02) on the right stick should be -80% to +80% in Turtle and -100% to +100% in Rabbit.
Yaw (CH04) should be near +/-50% in Turtle and +/-80% in Rabbit.