I'm using Samplitude 2016 version and there was a pop up keyboard on screen that I could use the mouse to click notes to play sounds, but it seems to have disappeared. How do I bring it back up? Thanks.
I presume that you mean Samplitude Music Studio 2016. I have 2014, and there was no keyboard as far as I can tell. In Samplitude Pro X3, the keyboard is under View, Keyboard, shortcut Ctrl+Alt+Shift+K. It may be the same in Samplitude Music Studio 2016.