You can adjust the record level in the keyboard, but I wouldn't worry. It's better to slightly under record and then use the 'Normalise' function in and audio editing app like Audacity to bring the level up. If you over record, you get digital clipping which sounds awful and is incurable.
You can also use Audacity for things like trimming the start and end points, easy fade ins and fade outs, adding extra reverb etc etc etc.