Managing Your Work Environment > Setting Preferences > Player Preferences >

# Playback

Use these preferences to set Player playback options.

Native Framerate button
  When enabled, Native Framerate uses the clip's framerate as the Player's playback speed. Use this option to play back a clip that uses a different framerate than the project. Note that the playback is a close approximation and may not be completely accurate.
Player 2:3 Insertion button
  Enable to allow viewing 23.97 fps clips at 29.97 fps in the Player and in the broadcast monitor. A virtual (temporary) 2:3 insertion is performed in real time. You can only play back with 2:3 insertion at normal speed. If you speed up or slow down playback, insertion is not applied.

This option only works if the project frame rate is 29.97 fps and the clip being played is a 24p clip.

Allow Soft Import Drops button
  Enable to keep soft-imported material synchronized with audio by dropping frames in real-time mode. Disable to play all frames.