Yes. USB bus power support was added in A-49 System Program Ver. 1.30 or later. Before connecting via USB, ensure your System Program is updated to the latest version.
Note: For instructions on checking your currently installed version and updating the software, visit the System Program download page: https://www.roland.com/global/support/by_product/a-49/updates_drivers/
To power the A-49 from USB, hold the [FUNCTION], [PITCH], and [ASSIGN] buttons simultaneously while connecting the unit to your computer's USB port or USB AC adapter.
Yes. The A-49 supports USB bus power and USB AC adapter power, starting with System Program Ver. 1.30 or later.
To enable this, hold [FUNCTION], [PITCH], and [ASSIGN] simultaneously while connecting the unit to your computer's USB port, USB AC adapter, or compatible device.
Note: Check your current System Program version and download updates from the System Program download page. For a full list of supported power sources, see "A-49: What power sources are supported, and how do I set them up?".