You can control master recording parameters on the Master Recording window. Access it by selecting the Record tab at the top of the window. Please refer to the following illustration for an example of this.
The controls provided are:
Master Input -- contains a list of the available input sources. You can choose only one input source at a time. The default choices are Microphone, CD ROM, and Line In. This list can grow to accommodate additional input device.
Gain (db) slider -- for setting the master gain (recording volume). The level is displayed next to the control (the value is 50 in the previous figure.)The displayed value changes as the slider is moved up and down.
Monitor slider -- for adjusting the volume of the incoming audio that is sent to the output device(s). It allows you to monitor the audio as it is being recorded.
Balance slider -- for setting the recording balance for the selected source.