Hi, I have a question about the presonus studio 18/24 that I had purchased. Does this device work as an analog without a USB connection? So I won't record audio but can I connect an instrument or audio device to the audio input channels and hear the sound from the outputs? I want to hear the sound of the instruments I use without being connected to the computer. Does this device support standalone mode? I ask you to help with the subject, I wish you good work. Thank you.