Stretch Markers

Introduction to Reaper

Stretch Markers are special markers that allow you to speed up or slow down a part of an audio clip. Unlike the normal markers that apply to the project as a whole, these are applied only to the element or elements selected at the time they are inserted. By dragging these markers left or right, the tempo of the clip on which they are inserted can be changed.

Insert the Stretch Markers

To create these markers you need:

- Place the playback cursor at the point where you want to insert the marker, or make a time selection starting and ending where you need to insert two markers.
- Select the element or elements to add the markers to.
- Right click to access the menu.
- Select Stretch Marker and then Add stretch marker at cursor to insert a single
o Add stretch marker at time selection to insert a pair of markers at the beginning and end of a time selection.

Edit the Stretch Markers

Once we have placed a Stretch Marker on a clip:

Stretch marker inserted into a clip

By placing the mouse cursor over the marker we have two possibilities of modification depending on how the mouse icon becomes, with the arrow horizontally we can move the time without changing the length of the clip, in this way the whole audio file will be stretched by increasing or by reducing the speed according to the direction of movement:

horizontal pointer

If the pointer is vertical, the length of the file will be changed by actually swiping only the audio that is in the direction of movement:

vertical pointer

Use of Stretch Markers

The stretch markers only modify the audio up to the nearest marker. In fact, the best way to work with stretch markers without ruining all the audio of the entire clip is to select the point we want to move and then delimit it with two stratch markers on the left and right, in this way we can be sure to modify only the audio contained between the two markers:

pointer in the center of two markers

Stretch Marker menu

Within the stretch marker menu there are some options that can be very useful.

stretch marker menu

In the stretch markers in selected itemes submenu, by clicking on snap to the grid it is possible to quantize all the stretch markers of the selected clip on the grid.

stretch markers in selected itemes

In the submenu transient guides Reaper gives us three options:

- calculate transient guides: automatically positions all markers on transients
- calculate transient guides for visible areas: automatically positions all the markers only on the transients visible on the screen
- clear transient guides: deletes all markers entered via transient guides.

transient guides.

Pre-academic course of Speech and Electronic Music.

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