Steinberg AXR4T Operation Manual page 29

Audio driver settings (dialog after
launching Cubase)
The dialog box will appear immediately after
launching Cubase, prompting you to select an
audio driver.
When using the AXR4, select either "Yamaha
Steinberg Thunderbolt" or "Yamaha Steinberg
Thunderbolt (High Precision)"
How to change the buffer size
You can change the buffer size in the settings
window for each application (DAW software,
etc.).
1.
From the Cubase series menu, select
"Studio"  "Studio Setup"
The open method of the settings window will vary
depending on the application.
2.
In the "Yamaha Steinberg Thunderbolt" or
"Yamaha Steinberg Thunderbolt (High
Precision)" menu on the left of the window,
click "Control Panel" to change the buffer
size.
Panel Controls and Functions (Software)
AXR4 Operation Manual 29