Mix Also referred to as a dissolve, a mix can be used to soften a transition. One picture fades in over another and replaces it. You can often create mixes in an offline and the EDL will read them. You won't need to go through the online assembly re-inserting them. Mixes can be as long or as short as you want them to be. They are timed in terms of frames. So a 12-frame mix will occur in the space of half a second.