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Undo Buffer

This is the temporary file created before you do any processing to a project. This undo buffer allows the ability to revert to previous versions of the project if you decide you don’t like changes you’ve made to the project. This undo buffer is erased when the file is closed or when you choose Clear Edit History from the Edit menu.

Undo/Redo

These commands allow you to change a project back to a previous state when you don’t like the changes you have made, or reapply the changes after you have undone them. The ability to undo/redo is only limited by the size of your hard drive. See Undo Buffer.

Undo/Redo History

A list of all of the functions that have been performed to a file that are available to be undone or redone. The undo/redo history gives you the ability to undo or redo multiple functions. To display the history list, click the down-arrow on the Undo () or Redo () button.

Video for Windows (AVI)

See AVI.

Virtual MIDI Router (VMR)

A software-only router for MIDI data between programs. Vegas software uses the VMR to receive MIDI timecode and send MIDI clock. No MIDI hardware or cables are required for a VMR, so routing can only be performed between programs running on the same PC.

WAV

A digital audio file format developed by Microsoft and IBM. One minute of uncompressed audio requires 10 MB of storage.

Waveform

A waveform is the visual representation of wave-like phenomena, such as sound or light. For example, when the amplitude of sound pressure is graphed over time, pressure variations usually form a smooth waveform.

Waveform Display

A section inside of the Trimmer window or on an audio event that shows a graph of the sound data waveform. The vertical axis corresponds to the amplitude of the wave. For 16-bit sounds, the amplitude range is -32,768 to +32,767. For 24-bit sounds, the range is -8,388,607 to +8,388,607. The horizontal axis corresponds to time, with the left-most point being the start of the waveform. In memory, the horizontal axis corresponds to the number of samples from the start of the sound file.

Zero-crossing

A zero-crossing is the point where a fluctuating signal crosses the zero amplitude axis. By making edits at zero-crossings with the same slope, the chance of creating glitches is minimized. Vegas software simulates zero crossings by applying short (10 mS default) fades to trimmed audio.

Zipper noise

Zipper noise occurs when you apply a changing gain to a signal, such as when fading out. If the gain does not change in small enough increments, zipper noise can become very noticeable. Vegas software fades are accomplished using 64-bit arithmetic, thereby creating no zipper noise.

GLOSSARY

APPENDIX B