We are located on the lower level of the Undergraduate Library, across from the ITS computer lab.
Phone: (919) 962-2559
Quick Page Navigation:
• Anatomy of the Audio Lab
• Anatomy of Logic
• Adding Effects
• Bouncing a Final Mix
Using Logic in the MRC
Logic is a pro audio application. It can handle recording, MIDI, mixing, and mastering. This tutorial will walk you through the basic functions of using Logic in the MRC Audio Lab.
Anatomy of the Audio Lab
The heart of the MRC audio lab is a dual G5 PowerMac computer. Connected to it is a MOTU 896 audio interface and a RODE NT1-A condenser microphone for capturing audio signals; a Unitor AMT-8 MIDI interface and a Steinberger 88-key weighted keyboard; and Behringer Truth 2032 speakers for monitoring, as well as a Line 6 POD guitar amp simulator and a Presonus Monitor Station for headphone and speaker mixes.
The Logic mixer can be used for hands-on control of nearly every function of Logic, from recording to mix down. You can use it to control 8 channels at a time, and it features full automation for mixing multiple tracks simultaneously.
The Anatomy of Logic
There are several windows in Logic. They all allow you to access different parts of the application and give you great flexibility in handling your projects.
a. Arrange View
Arrange view allows you to see the names, numbers, and waveforms of each audio track and MIDI track you have recorded. You can customize the view by adding or removing tracks as you see fit. You can adjust the placement of the different tracks, the duration, speed, etc., of what you have recorded, and so on. You can decide which track to record on, delete bad takes, and cut, copy and paste to assemble a recording.
b. Mixer View
The mixer view imitates an analog mixing console. You can adjust input levels, output levels, effect sends and returns, busses, and synth settings. You can also customize the layout of this window by adding or removing channels.
c. Matrix Edit Window
With the Matrix edit window, you can program MIDI information into Logic by hand (rather than playing it on a keyboard). You can place notes on a MIDI event list and assign a synth voice to perform it.
MIDI, or Musical Instrument Digital Interface, can be used to program a synthesizer to play sounds in a way that imitates a human performance. Logic has a few excellent synths built in, including the EXS24 and others. The MRC audio lab has an 88-key MIDI input keyboard that can be used to record a performance.
To record a MIDI performance, select a MIDI track to record by double-clicking on one of the Audio Instrument tracks in the Arrange view:
This will put the track in ?record ready? mode, and the mixer window will pop up with the track you have selected highlighted. Select a synth voice by clicking and holding on the unmarked button above the channel fader. Choose from mono, stereo, and multi-channel synths. In this example we will use a Stereo synth, the EXS 24.
Once you have selected a synthesizer to use, you must select a voice. Do this by clicking on the ellipsis button on the top center of the synth window. A menu will appear, letting you choose from different voices. Once you have selected a voice, you are ready to record.
Go back to the Arrange view. Position the cursor where you want to begin recording. On the transport control bar (or on the mixer), hit Record. Logic will bring the cursor back 4 beats early and count off with the metronome, and then you can record the performance.
To record on an audio track, place the microphone in front of the sound source you want to capture. The microphone is plugged into input 1 on the MOTU interface, so you can adjust the input gain with the knob on channel 1. Make sure to turn the phantom power switch to the on position before connecting a condenser microphone.
If you are using a different mic, make sure the phantom power is set correctly for the type of mic you are using (on for condenser, off for dynamic). If you don't know what kind of mic you have, ask the media lab attendant. You should also turn off the speakers when you record audio to prevent feedback and bleeding. The power switch for each speaker is on the back of the speaker.
You can monitor your recording by connecting headphones to the MOTU
and adjusting the volume normally.
Prepare a track to record by pushing the record-ready button (it looks like the letter R) on the track in the arrange view. When you are prompted to save the recording, select your folder on the Data Disk as the destination.
Check that the signal level is appropriate (not overloading the input, but loud enough to be heard clearly) by adjusting the gain on the MOTU. Position the cursor where you want to begin recording. On the transport control bar (or on the mixer), hit Record. Logic will bring the cursor back 4 beats early and count off with the metronome, and then you can record the performance.
To record additional audio tracks, either connect the microphone to a different input on the MOTU, or drag the recording that is on the track you recorded on to a different audio track before recording on that track again.
Mixing is the process of adjusting the output volume of each sound so that each signal is at the right level relative to all the other signals, and the process of adding effects or coloring each sound. To adjust the levels of your recorded sounds, you can use the Mixer view in Logic or the eMagic mixer. If you are using the eMagic mixer, make sure to use the input select buttons at the top of the mixer to select the channels you want to adjust.
In either case, you can control the output levels by moving the fader on a channel up and down to raise and lower the volume. If you do this on the mixer while the track is playing back, you can create automated fades by adjusting the track's volume over time.
There are 2 ways to add effects to a track: as an insert or on a buss. Insert effects are applied only to one track. The types of effects commonly used for inserts include dynamic control like compression and gating. Bussed effects are used in a send and return fashion: the original sound is sent to the buss where the effect is added, and the buss returns the effected sound to the original track. A buss can affect as many tracks as you send to it. Nearly all modulation effects, like reverb, chorus, delay, etc., get used this way. Using effects this way preserves processor power on the computer and is less likely to cause the computer to crash than using many inserts.
a. Insert Effects
To apply an insert effect to a sound, select the appropriate track on the channel strip. In the mixer view there are two Insert buttons at the top of the strip. Click and hold on one of those, and a menu will appear. Select the effect you want to use.
Once you have selected the effect, a window will open in which you can adjust the parameters of that effect. Close the window once you have the effect set the way you want it.
b. Buss Effects
To apply one effect to several tracks, place the effect on a buss. In the mixer view, go to Buss 1 and create an insert effect on the buss.
To use this to affect a track, go to the track in the mixer view. Click and hold on one of the buttons on the I/O portion of the channel strip. Select Buss 1 as the destination (leave output 1 selected as well as an additional output).
Adjust the send level with the knob above the I/O buttons. On buss 1, adjust the output level to hear the effect when you play the recording back.
Bouncing a Final Mix
Once you have everything set the way you like it, you are ready to create a stereo 2-track master of your recording. Identify what outputs all the tracks are getting sent to. By default they are sent to output 1. On the output channels, push the Bounce button on the bottom of the strips you are using.
You will be prompted to choose a save destination and name for your recording. Choose your folder on the Data Disk. Logic will play the song back from start to finish and record it as a separate recording.