In Soundtrack Pro, click on the New Audio File icon at the top of the Project Window toolbar:

You will get this prompt:

Choose Mono and 4800 Hz Sample Rate and click on OK.

Your screen now should look something like this:

In the Utility Window at the upper right, click on the Recording tab.

Set the Input selection to either Built-in Microphone for the microphone built into the computer, or Built-in Input if you are using an external microphone.

(In order to listen to your audio as it is being recorded, you must plug in earphones and change the Monitor setting to built-in output)

Here you can view the input levels of your audio in the vertical meter on the left, and you can adjust the input volume of your audio using the Gain slider to the right. Use the Gain slider to adjust the input level so the loudest audio is in the minus zone on the meter.

Note: on some Mac computers, the built-in sound card does not support adjusting the audio input levels in Soundtrack Pro, and you'll see the Gain slider grayed out. In this case, you can adjust the audio levels of the sound in one of three ways:

1. By adjusting the input levels using the Sound selection in Apple's System Preferences menu, as shown in the previous step.
2. By adjusting the output volume control (headphone volume) on the minidisc recorder or other device.
3. By adjusting audio levels in Soundtrack Pro after importing the audio.

Also note that on Mac computers with this problem, you can bypass the issue by importing audio through a USB break-out device such as a Griffin iMic or Digidesign M-Box. The Soundtrack Pro input gain slider will always be available when using USB audio input.

Now queue your minidisc player to the audio segment that you want to import and press pause on the minidisc recorder.