First and foremost, you must have the hardware interface that allows you to have multiple inputs at the same time and route them to channels in the software.

Most DAW's will support 2 channels at a time (simple stereo inputs) .... and many will support as many as your hardware interface will deliver.

I don't use Real Band for recording so I'm not really sure if it can handle more than one or perhaps 2 inputs at a time. Regardless, your hardware also has to be compatible.

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