Audio Output Connections

What are the specifications of the USB sound card (audio interface) function?

Can this unit's MASTER1 outputs be connected to an amplifier's RCA inputs using an XLR-RCA converter cable (converter plug) and vice-versa for MASTER2 outputs?

What are the specifications of the SEND/RETURN terminals?

The BOOTH terminal is a 3-pin (TRS) phone jack. What are the polarities when using it as a balanced terminal?

Does the BOOTH terminal support 3-pin (TRS) phone cables?