Connect any instruments or other equipment to your PC. If you own an external sound card with instrument jacks, you can connect it through your USB or FireWire hub. Otherwise, you can connect guitars, microphones and other devices using specialized USB cables, such as USB guitar cables and USB-to-XLR connectors.
Open Logic Pro, click the "Logic Pro" menu at the top of your screen and select "Preferences," "Audio." Select your interface or other USB or FireWire device on the "Device" pop-up list. If you do not plan to connect external equipment, you can skip to the next step.
Click the "Track" button near the top of your project window and select "New" from the list. When the navigation window appears, select the "Audio" button and click "Create." A new horizontal space will appear on your screen, known as an audio track. On this track, you can record a layer of music.
Click "Record" at the bottom of your project window. It appears as a gray dot, near the center of the bottom strip. Record audio using your connected hardware or internal microphone, and click "Stop" when you finish. The "Stop" button is a small gray square near the "Record" button.
Create additional audio tracks to add layers of music. For example, if you record yourself singing on the first track, you can then record a guitar or piano melody on the second track and percussion on the third track, gradually creating a multilayered composition.
Add instrumentation using Logic's software instruments. In addition to recording your own instruments, you can use virtual instrumentation to fill in the gaps. Create a new track, but instead of selecting "Audio" on the navigation menu, select "Software Instrument." Open your mixer by simultaneously pressing "Cmd" and "2" on your keyboard, and click the "Input" (I/O) box to select your instrument.
Play your software instrument. With your instrument now selected, you have two options for playing the sounds. You can connect an external MIDI keyboard (sold in music supply stores), or you can press "Caps Lock" to activate your virtual piano and use the keys on your computer keyboard to play the notes. Click "Record" to record your MIDI notes.
Add effects by returning to your virtual mixer and clicking the "Inserts" boxes on any channel strip --- each strip corresponds with one of your tracks. When the effects appear on your screen, select one with your mouse. You can select as many as five effects for each track.
Bounce your audio. In Logic, bouncing refers to the process of exporting your multilayered project as a single, self-contained file, like an AIFF (uncompressed) or MP3 (compressed) file. Click the "File" menu at the top of your screen and then click "Bounce." Enter a name for your song, choose your desired format and click "Bounce."