Yes. There are two ways to play back audio from a computer or mobile device through the ME-90B while you perform.
Connect the ME-90B to a computer via USB
Note: Please use a USB cable that supports data transfer. Install the dedicated USB driver before making the USB
connection. Download the latest version from https://www.boss.info/global/support/by_product/me-90b/updates_drivers/
Make sure USB DIRECT MONITOR is set to d1 (ON) in the system settings.
Connect the ME-90 to a mobile device wirelessly
Attach the Bluetooth® Audio MIDI Dual Adaptor (BT-DUAL) to the ME-90B to wirelessly play back music on your mobile device and feed it to the OUTPUT and PHONES jacks on the ME-90B.
Note: Playback volume must be adjusted on the mobile device. For details on connecting, see "Wireless connection with a mobile device" in the ME-90 Reference Manual.