GENERAL
The SCRATCH Editor section provides non-linear editor functionality in a multi-layered timeline environment. Also, when switching to Source-mode in the Player, the module shows and allows you to edit the timings of your composite elements.
One of the main differences of the Edit menu as compared to other menus in the Player is that you can re-size the menu panel: By clicking the gripper next to the Animation button and dragging it up or down you can change its vertical size.
The Edit panel itself consists of two sections - the top part with the controls and the lower Edit Panel with the timeline edit bars which re-sizes with the menu panel as a whole.
SHUTTLE
The longer vertical red line is the current frame position marker. This indicates which frame is currently being shown in the Viewport. The frame position marker also determines the currently selected clip and slot. Clicking anywhere in the editor panel will change the frame position. Alternatively you can place your cursor over the red frame position marker. The cursor switches to the Shuttle cursor, 
and you can click and drag the frame position marker to any point in the timeline. The red position marker is linked to the mini-timeline underneath the Play controls.
At the bottom of the Edit panel the current position is either displayed as timecode or as frame number. The format is linked to what you have set for the Viewport Toolbar info panel (middle part of the toolbar). See Chapter - The Player for changing the displayed information and format.
TRACK SELECTORS
At the far left of the Edit Panel the Track Selectors are displayed. The Track Selectors were already discussed in Chapter - The Player.
ZOOM AND PAN
The Edit Panel re-sizes with the Edit menu as a whole. You can also pan and zoom the timeline in the Edit Panel interactively, using a set of Quick Keys or use the zoom buttons on the far right of the Edit Panel.
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• Quick Key: Alt + Drag Left/Right
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» Zoom the Timeline in or out
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• Quick Key: Spacebar
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» Pan across the Timeline
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• Quick Key: Home
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» Zoom out to display the entire timeline
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• Quick Key: Alt + Home
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» Zoom so that the current shot fills the width of the Edit menu.
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• Quick Key: '+'
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» Zoom in on the whole timeline.
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• Quick Key: '-'
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» Zoom out on the whole timeline.
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• Quick Key: Alt + Mouse Wheel
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» Zoom in / out on the whole timeline.
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Zoom out on the Timeline. This always zooms around the current frame position, which will become centered in the Timeline.
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Zoom in on the Timeline. This always zooms around the current frame position, which will become centered in the Timeline.
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Zoom out to display the entire timeline.
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Zoom so that the current shot fills the width of the Edit menu.
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USER PREFERENCES
Open the User Preference dialog, by clicking the gear-icon in the lower right corner of the screen, to get various setting on how the Editor presents itself: show/hide thumnbnails on the edit bars, show/hide clip names, etc.