Last Modified: June 30, 2010Article: HT3656

Logic 9: Tips for phase-locked drum edits

SummaryLearn to use Flex editing with Logic 9 to easily quantize and adjust the timing of recorded tracks.

Products AffectedLogic Studio (2009), Logic Pro 9

Use Flex editing to adjust the timing of groups of drums tracks while maintaining phase accuracy among the tracks.

Create a Group

First create a group for the drum tracks. You should do this before you record the tracks, but you can do thisafterward if necessary. However, you need to create the group before you start editing the drum tracks. To createthe group:

Click inside the group slot in one of the drum track channel strips.1.

Choose an unused group from the drop down menu.2.

The Group Settings window will open. Click to enable the options for Editing, Phase-Locked Audio, and Record.It's also a good idea to give the the group a descriptive name.

3.

Logic 9: Tips for phase-locked drum edits http://support.apple.com/kb/HT3656

1 of 5 11/16/11 4:23 PM

Close the Group Settings, then Option-click the group slot in each of the other drum track channel strips toassign them to the group.

4.

Record and Edit

Record the drum tracks. When you're done recording, use Quick Swipe comping to create the best composite take.Make any other edits, such as copying sections from one part of the song to another, and so on.

Flatten and merge

When you're satisfied with your comping and editing, flatten and merge the take folders:

Click the disclosure triangle in the upper right corner of one of the take folders.1.

Logic 9: Tips for phase-locked drum edits http://support.apple.com/kb/HT3656

2 of 5 11/16/11 4:23 PM

Choose Flatten and Merge from the drop-down menu.2.

Note: This is recommended because phase-locked editing requires that all tracks in the group have the samestart position and be exactly the same length. By merging all the regions and takes on each track to one audiofile, discrepancies are less likely to appear. Also, because Logic's transient detection is file based, you need togo through the process of adjusting transients only once for each Q-Reference track.

Choose tracks as Q-Reference

Decide which tracks should be used as Q-Reference tracks that will be used to determine quantization for thegroup. Typically, a snare and kick drum track are used as reference tracks. If you used multiple microphones oneither drum, choose one track for each.

Open one of the tracks you want to use as a reference in the Sample Edit window and choose Audio File >Detect Transients.

1.

After Logic analyzes the file, check the transients in the Sample Edit window to make sure they are positionedcorrectly. Use the "+" (plus sign) and "-" (minus sign) buttons to add or subtract transients, move incorrectlyplaced transients, or manually add or remove transients with the pencil or eraser tools.

2.

Repeat these steps for any other files you will use as Q-Reference.Note: It's not necessary to adjust the transients for the other tracks in the group; their timing will be adjustedwith sample accuracy based on the transients in the Q-Referenced tracks.

3.

In the Track Header of the Arrange window, enable the Q-Reference button for the tracks to be used as timingreference.

4.

Logic 9: Tips for phase-locked drum edits http://support.apple.com/kb/HT3656

3 of 5 11/16/11 4:23 PM

Note: If you need to return to the Sample Edit window to adjust the transients for any of the tracks after thisstage, it's very important to disable the Q-Reference buttons for all tracks in the group first, otherwise, thetransient edits will not carry over to your subsequent timing adjustments.

In the Channel Strip parameter box for one of the tracks, click the Flex drop-down menu and choose one of theFlex Modes. For drums, Slicing is usually the best choice, but feel free to experiment with the others. The FlexMode will be assigned to all tracks in the group.

5.

Enable Flex View in the Arrange window

Click the local View menu in the Arrange window.1.

Choose Flex View from the drop-down menu.2.

Logic 9: Tips for phase-locked drum edits http://support.apple.com/kb/HT3656

4 of 5 11/16/11 4:23 PM

Apply Timing Adjustments

Perform your timing adjustments. For example, apply quantization to the tracks, or manually insert flex markersand drag audio in the reference tracks to desired positions.

When you apply quantization, you may find that some transients are quantized to unexpected positions. Forexample, if you choose a quantize value of 1/8 note, you may find that in places where there is no transient on the1/8 note grid, a transient in between grid positions, such as an in-between 1/16 note is moved to to the nearest1/8 note. You can prevent this by setting an appropriate Q-Range value in the region parameter box:

Click the Advanced Quantization disclosure triangle at the bottom of the region parameter box.1.

Click the up/down arrows to the right of the Q-Range parameter.2.

Choose a relatively short value, such as 1/24 or 1/32. Experiment until you get the result you want.3.

Note: Q-Range limits quantization to transients that fall within the value you choose. For example, if you choose1/32, then any transient farther away than 1/32 note from the quantization grid you choose will not be quantized.

Logic 9: Tips for phase-locked drum edits http://support.apple.com/kb/HT3656

5 of 5 11/16/11 4:23 PM