Using this Roland M - 400 48 - channel digital live audio mixer is quite straightforward. First, make sure you connect it to the correct power supply included with the product. When using, just operate as you would with a normal audio mixer. As for the encoder caps, although they're third - party replacements, they function properly, so you don't have to worry. Just handle them gently. When it comes to maintenance, keep the mixer in a dry and clean place. Avoid exposing it to excessive moisture or dust. If you notice any further issues with the REAC Card not communicating, it's best to consult a professional for help.