The line-in input on your Mac isn't meant for a microphone. Instead, you'll need a USB audio interface. Learn about them and what type of microphone is used to make MacMost Now.
You can have your Mac speak text to you and also have it save that audio as a file that you can listen to later or even on your iPhone after syncing the file via iTunes. Learn how to take a text file and convert it to a spoken word audio file using the Terminal.
You can use your own sounds for alerts in macOS Sierra and Mail. You'll need to convert the sounds to AIF format and put them in the Library folder. Then these custom sounds will show up after restarting System Preferences or Mail.
You have to ability to convert audio files to a variety of formats from iTunes. The conversion leaves a duplicate in your iTunes library, but you can also locate the file. It can be useful, for instance, to convert AAC files to MP3 if you need to play them back in players that only support MP3. You can also convert video to formats supported by iOS devices and Apple TV.
You can use GarageBand as a way to record your voice or anything with your Mac's microphone. You can record bits and pieces and rearrange and edit them. You can also overlay tracks. Each track can be altered with editable filters. You can then export your audio as a standard file to share or use in other software.
The OS X Finder offers simple options to compress video and audio files. You can use this to quickly re-compress these files before archiving them or sending them to others. These simple functions only work with some file types and offer limited options.
You can use QuickTime Player in Lion to edit audio files as well as video. You can trim down the audio, getting rid of unwanted sections at the beginning and end. You can also use the same technique to divide an audio file into several parts.
Automation curves are what let you control volume over time for an individual track or an entire song in GarageBand. In addition to volume, you can also control panning and sound effects. Master Track automation curves let you control pitch and tempo as well.
It is difficult to change the tempo of an individual track in GarageBand because all tracks will match the tempo of the song by default. But if you copy tracks into new loops, you can hold the speed of those tracks steady as you adjust the tempo of the song.
Learn how to record your voice in GarageBand. You can record in segments, replacing and removing as you go along. You can also add intro music and background music. See how to export the final product as an audio file.
Learn how to record audio coming from applications using SoundFlower and WireTap Studio. SoundFlower acts as alternative sound input and output devices on your Mac. WireTap Studio lets you record and edit sound coming from all internal sources.
You can record multiple microphones each into its own track in GarageBand. First you must set up an aggregate device using the Audio MIDI Setup utility. Then you need to enable multitrack recording in GarageBand and give each track a channel from the aggregate device. To get all microphones working well it takes some trial and error.
Learn about GarageBand 11's new features that help you adjust the timing of recorded tracks. You can force one track to match the beat of another, adjust individual notes or force a track to adhere to consistent timing.
iMovie 11 allows you to set the volume for specific portions of the audio track. You can adjust the sections of volume control and set fade in and out times for each section. You can also apply audio effects, filter sound using an equalizer and layer multiple tracks of audio.
iTunes lets you use a variety of file formats for ripping CDs or converting music. Learn about each one: AIFF, WAV, MP3, AAC and Apple Lossless. Decide which format might work best for your music collection.
Audacity is a free open source sound editor that anyone who edits audio should have on their Mac. It allows you to record, edit, alter and export sounds. It can be much easier to use than GarageBand for simple tasks.
You can use GarageBand as a simple audio file editor. Just drag and drop a sound file into GarageBand to edit it. You can adjust the volume, cut out parts of the sound and apply filters. You can then export as a standard sound file or a compressed file.
Since your Mac can handle more than one audio device, it is important to know how to tell it which device to use for output and input. For instance, you can have external speakers and a USB headset, as well as several microphones. You can set this system-wide, or for individual applications like iChat, GarageBand, Audacity and Skype.
Learn how to make a simple music loop using GarageBand in this excerpt from the MacMost.com Guide to Switching to the Mac by Gary Rosenzweig. You can use simple loops in photo slideshows, videos and other projects.
Many users never change the iTunes Import Settings, but it is important that you check them out and make sure that iTunes is importing your CDs using a format that you like. The default AAC may not provide the versatility that you need.
You can use GarageBand to edit your video's audio. You can filter the audio, add music, adjust the volume and re-arrange the sound.
Learn how to create layers of audio in iMovie 09 and to adjust the volume of each layer and add sound effects to your iMovie projects.