Change the musical length of a pattern in Logic Pro for iPad

Several factors determine the musical length of a Step Sequencer pattern (the time in bars and beats before the pattern repeats) in Logic Pro for iPad. The most fundamental are the pattern length, which defines the maximum number in steps available to each row, and the pattern step rate, which defines the length of each step in musical divisions (note values).

Another important factor affecting the musical length of a pattern is the Loop Start/End edit mode. Using Loop Start/End, you can set the number of steps for each row independently from the pattern length and the length of other rows. Technically, the musical length of a pattern is the length of the longest row. For example, if all rows in a pattern loop after 4 steps, and each step has a step rate of 1/16, then the musical length is only one beat (1/4), even if the pattern length is 16 steps or longer.

When row lengths are evenly divisible, the overall length is equal to the length of the longest. For example, if you shorten several rows in a 16-step pattern to 4 or 8 steps (which both divide evenly into 16), the pattern remains a one-bar pattern. When row lengths are not evenly divisible, however, the musical length is increased (sometimes substantially) because the pattern doesn’t repeat until all rows start at the same time again.

Using the Skip edit mode can also result in the length of rows changing, which affects the overall musical length of the pattern in a similar manner to changing the Loop Start/End setting.

The playback mode can also affect the musical length of the pattern. Choosing Ping Pong as the playback mode doubles the pattern length, while setting any row to Random playback mode can result in the musical length of the pattern being essentially infinite.

Ultimately, how long a pattern plays in a project depends on the length of the pattern region or pattern cell. If the musical length of the pattern exceeds the region or cell length, it plays only until the end of the region or cell is reached. When the region or cell length exceeds the pattern length, the pattern repeats until the end of the region or cell, or restarts if the region or cell is looping. If the musical length of the pattern, or of any row, does not fit equally into the region length (or cell length), the rows in the pattern restart before they complete a full cycle.

Change the pattern length

In Logic Pro, choose a new length from the Pattern Length pop-up menu in the step grid header.

When you increase the pattern length, the added steps duplicate the existing pattern. You can edit the added steps to add variation or change the pattern.

When the pattern length is more than 16 beats, the entire pattern may not be visible in the step grid, depending on the zoom level. In this case, the pattern is divided into sections called pages, each showing a part of the complete pattern. An overview of each page appears above the step grid. You can tap the page overviews to quickly switch between different parts of the pattern.

You can also change the pattern length in the inspector.

Change the step rate for the pattern

The step rate sets the duration of steps in the step grid as a note value. You can set the step rate for the overall pattern, and set a different step rate for individual rows and steps.

In Logic Pro, tap the Page Switch button in the pattern controls until you see the Step Rate button .
Tap the Step Rate button, then choose a new step rate.

You can also change the step rate for the pattern in the inspector.

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Logic Pro User Guide for iPad

Change the musical length of a pattern in Logic Pro for iPad

Change the pattern length

Change the step rate for the pattern