If
the recording sound volume is low, increase loudness at “Gain”
control below 'Audio Track' button by sliding 'Gain' to the right.
While recording, if spectogram (the visual representation of the spectrum of frequencies of your recorded track) falls below your desired levels, wait for end of recording, then increase loudness by sliding Gain to the right. Play track to satisfactory level before saving to folder. If you are still unsatisfied with the sound after saving, just drag the track to the spectogram area & increase the Gain by a notch or two as above. It is important to note that the recording levels of all your tracks are close to uniform as otherwise you may be adjusting the volume as you play each track !
Hope this helps !