Yamaha TNR-e Quick Manual page 6

[L3]
+ LED buttons
Sets the playback pitch in octave increments.
While holding the [L3] button, slide your finger vertically over the matrix
to move the lit horizontal line to the desired octave.
[L4]
+ LED buttons
Sets the loop playback range in the Score Mode.
While holding the [L4] button, slide your finger horizontally over upper
half of the matrix to move the loop start point indicator to the desired
point, and slide your finger horizontally over lower half of the matrix to
move the loop end point indicator to the desired point, as required.

In the Random Mode this function sets the rotation direction and speed.

Not available in the Draw, Bounce, Push and Solo Modes.
[L5]
+ LED buttons
Sets the loop playback speed (the duration of the beats).
Four settings are available, set via the leftmost four columns on the
matrix: quarter notes, eighth notes, sixteenth notes, and thirty-second
notes.
While holding the [L5] button, tap a button in the corresponding
column.

Not available in the Push Mode.
[R1]
+ LED buttons
Switches to a different layer.
While holding the [R1] button, slide your finger vertically over the matrix
to move the lit horizontal line to the desired layer.
Moving the line to the lowest row selects layer 01, the next row up is
layer 02, then layer 03, and so on up to layer 16.
TNR-e Quick Guide
Changing Octaves
Changing Loop Points
Changing Loop Speed
Switching Layers
+5
-5
Layer
16
01
Function Buttons
6