For the gearbox button you have 6 modes: D1, D2, D3, S1, S2, S3 (D = automatic, S = manual with S3 being best performance). You can also put it in manual mode by pressing the paddles on the wheel or pushing the gearstick forward (+ plus) or back (- minus).
The other button you weren't sure about is throttle/engine response. As was mentioned you can map them to the M1 and M2 buttons on the steering wheel.
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