tnussb
30
If you mean the usb audio-interface: You connect the audio outs of your Elektron device(s) to the usb audio-interface and the interface via USB to the laptop. In this regard it is not different than using the Analog Heat.
If you wait for Overbridge: no additional hardware would be required. Just the usb connection from the A4 to the laptop. But Overbridge isn’t available yet and there is no (new) release date announced.