You can record from both microphone and speaker on a Mac just like Windows computer. However, not all Mac tools will support both internal and external recordings. External audio is a recording performed on an external source that is plugged into the computer like a microphone. Internal audio refers to recording audio on the speakers that are plugged to the computer. The following are 3 ways on how to record audio on Mac:  

1. Mac users can use QuickTime to record external audio. QuickTime is for using to watch movies but it also has a built-in audio recording functionality. QuickTime can output your audio recording into an m4a file. The m4a file is a compressed audio file that can be played on iTunes, Android phone, iOS devices and media player that support this format on Windows computer. QuickTime does not put any limit on how long you can record your audio.

You can find the QuickTime player by going to Applications. When QuickTime is launched, you can go to File > New Audio Recording. The Audio Recording box will pop up and you are to press the red button to start recording. You must press the same Red button again after you’ve finished recording. Finally, you must go to File > Save to save the recording.  

QuickTime not only can record from a microphone, but also from another line in the sources. To change the source, you simply plug in the new line in source and select the source from the triangle drop-down menu. Although it can be used to record microphone, it is not designed for use in making a professional recording. It is intended for small recording tasks like record notes, and sound effects.

2. You also have the option of using Garageband to record a microphone that is plugged into your Mac. Garageband is bundled free on some Macs. To make a recording, you must press the Record button. When you’ve finished recording, you can press the green play button to stop the recording. You can press the green play button again to playback what you’d recorded just now.

The green slider will appear if you’re plugged in microphone support software level control. You can drag the left green slider to adjust the volume on the left speaker. Similarly, adjusting the right green slider will change the volume level on the right speaker. To save the recording, you can press the done button. If you detect some noises in the background, you can use the noise gate slider to reduce it. The noise gate slider can be accessed by tapping on the input button.

3. Alternatively, you can use a third party software like Movavi Screen Recorder Studio for Mac to record the audio. It can record both internal and external audio. By default, the audio recording feature is enabled when you launch it. Disabling the audio recording means no sound from the speaker will be recorded.

If you want to capture external sound from the microphone, you can enable the microphone feature in the control panel. If you want to display a prop up, you can open the image in an image viewer and click the crosshair cursor on it to set the recording frame over it. When it is selected, you can press the REC button to start recording.

You must keep in mind that the audio recording file can get big fast. If you have a long recording, you can make it shorter by deleting the part in the beginning and at the end. The trimming tool can be accessed when you press the stop button in the control panel. You can move the marker along the player to find the unwanted section. To delete it, you must first drag the marker to select it. After that, you can either press the Del key or the trash button to delete it.

You can also split your video into various parts to save space on your computer. You can do this in the video editor that comes with the software. It can be accessed by clicking the Open in Editor Button. To split a video, simply move the red marker to the point where you want to split and press the scissor tool in the timeline. To tweak the audio, you can click on the properties button and go to the audio tab. In the audio tab, you can adjust the sliders to tweak the audio including speed, volume, and noise suppression.