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Connecting Musical Instruments to Your Computer
There are basically two types of musical instruments: electric and acoustic. An electric instrument has a built-in interface to output its sound, but an acoustic instrument needs a microphone to record its sound.Electric instruments include electric guitars, keyboards, and electric bass.You can connect an electric instrument directly to the computer's audio-in port, if your computer has one. The computer audio-in port is a 1/8-inch mini input, so you will need an adapter or cable to convert the 1/4-inch phono output from your instrument to the 1/8-inch audio line-in port (mini input) on the computer.Lesson 9.. You can find out more information about the iGuitar at http://www.brianmooreguitars.com.
Setting Preferences for the Audio-In Port
If you plan to record through the audio-in port on your computer, you will need to set the System Preferences accordingly. The System Preferences are located under the Apple menu (blue apple) in the upper-left corner of the computer screen.Let's change the preferences to record through your audio-in port. If your computer doesn't have an audio-in port, you won't be able to make the changes, but you'll know how to do it if you ever use GarageBand on a Mac with audio-in.
| 1. | Click the blue apple to open the Apple menu. This menu is always available, even when you're running an application. |
| 2. | Choose System Preferences from the Apple menu.The System Preferences window opens. [View full size image] |
| 3. | Click the Sound button to open the Sound Preferences window.The Sound Preferences window opens. |
| 4. | Click the Input button to see the sound input pane in the window. The input options on your computer will reflect the current audio devices and hardware that you are using. It is very likely that your input options will be different from the ones shown in the screenshots. |
| 5. | Select the audio interface that you will be using for the recording.If you are using the audio line-in port on your computer, select Line In from the sound input list. Likewise, if you are using the optical digital-in port choose that selection.[View full size image] |
| 6. | Play a riff on your instrument and notice the input level on the Input level meter. |
| 7. | Click-drag the Input volume slider to raise or lower your input volume levels as needed.The Input level meter shows the level of your input from left to right. Left is the lowest input level (quietest), and right is the highest (loudest). If your input levels are too high, you will "overdrive" the input, which means the recording is louder than the device can handle and your music will be distorted.If the device you select does not have input controls in the Sound Preferences window, you can raise the output volume on your instrument or device.[View full size image] For this exercise I'm using the EDIROL PCR-A Audio Interface/MIDI Keyboard Controller as an input device. As you can see in the illustration, this device does not have an Input volume slider in the Sound Preferences window. |
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