So when I open up a new song and go through to set up the i/o's, everything is in order. I select my interface (Tascam US-1800) from the dropdown and make sure all my inputs are mapped correctly. Then I go to set up the output, which I prefer to just use the "built-in output" option as I just run my computer audio through external speakers. This all seems to work fine and when I set up EZ drummer and other vst's through instrument tracks I get playback no problem, but for some reason I don't get any input signal from my interface for any of the inputs? When I tried switching to the Tascam output, I still got no input signal plus there was major lag and skipping in the playback of the instrument track.
I'm running Studio One 3 on Mac os X 10.11 - 8gb ram, running through a Tascam US-1800.