In which automation mode should your tracks be set to play back automation without overwriting it?

The mode that allows tracks to play back automation without overwriting it is the Read mode. In Read mode, Pro Tools plays back the recorded automation data, ensuring that all parameter changes that have been captured during previous sessions are preserved. This is crucial for maintaining the intended mix, as it enables the engineer to reproduce complex automation moves without accidentally erasing or altering them.

In contrast, Write mode is designed for recording automation and will overwrite any existing automation data, which is not desirable when you want to preserve previous work. Latch mode also allows for automation to be recorded, but it may overwrite existing information if the fader is moved during playback. Touch mode allows for temporary adjustments to automation while the track plays, but like Latch, it can overwrite automation values if the fader is moved. Therefore, Read mode is the most appropriate choice for simply playing back automation accurately.