1) To fade in and out, you grab the top left and right handles on your audio clip and drag them. You can right-click on the fade-in/out to change the kind of fade you want.
If that’s not good for you, you could also fade-in/out by using a automation lane set up for “level” (Right click on the track header to bring the menu up.)
2) Yes. You can copy and paste audio and midi clips to make loops. By default, Podium will paste things as a copy. You can tell when something’s copy because it will have a + sign next to its name. You can use the handles in the bottom left and right of the clip to crop the sound non-destructively. You can also convert a copy to a unique clip from the menu when you right-click on the clip.
3) There’s no horizontal scroll bar. You can scroll horizontally using the navigator panel, or by left-clicking on an empty space in the track window and dragging left or right.
Aaand, I’m answering all your question because I’m procrastinating instead of writing music like I should be…
Dammit. π