The design is neat (I generally like dark themes) although the fading animations got a bit annoying after a few minutes using it. Some of the dialogs could do with supporting common shortcuts (e.g. enter to create a new track, escape to close the dialogs). Sometimes I managed to click outside of the presentation view without realising, and then left/right arrow keys stopped working. Sometimes I wasn't sure where to find certain functions (e.g. I looked for "Edit" on a presentation item on the context menu, but then realised I had to click it and then click the pencil icon). I couldn't get the Share functionality to work, and wasn't sure why it was in its own context menu with no other items.
I'm not sure I understand the purpose of the tracks/channels distinction. I can understand creating a project to store presentations (items) in, but why is there another level in Kobble?