Output Audio Files:

Filename	Description
New8mono.wav	Empty 8-bit mono WAV file
New8ster.wav	Empty 8-bit stereo WAV file
New16mon.wav	Empty 16-bit mono WAV file
New16ste.wav	Empty 16-bit stereo WAV file
New20mon.wav	Empty 20-bit mono WAV file
New20ste.wav	Empty 20-bit stereo WAV file
New24mon.wav	Empty 24-bit mono WAV file
New24ste.wav	Empty 24-bit stereo WAV file
New32mon.wav	Empty 32-bit mono WAV file
New32ste.wav	Empty 32-bit stereo WAV file

These files can be used on the DrawingBoard as if they were standard (i.e. non-empty) WAV files. When data has been written to any such file (i.e. after playing the DrawingBoard), it is advisable to change its name so as to preserve the recorded data as well as to preserve the "place-holder" name for new files. The name of any file on the DrawingBoard can be changed by double-clicking on its filename. This will open a conventional "Save As" file dialog box which can then be used to rename the file in the usual "Windows" manner.

Multiple copies of the same output file are not permitted on a DrawingBoard, though the same output file can appear on any number of DrawingBoards simultaneously.

An output WAV file can be written with any sample rate, and multiple output files with different sample rates can be written simultaneously on a DrawingBoard, as long as the rules of connectivity for multiple sample rates are adhered to (see the WaveWarp Users' Guide for more information.)

When the DrawingBoard is played, the audio data going to a given output WAV file is converted from WaveWarp's internal floating-point representation (nominally over the range -1 to +1) into the integer representation corresponding to the bit-resolution of the WAV file (8-, 16-, 20-, 24-, or 32-bit). It is at this point that digital clipping can occur, usually with undesirable consequences. To avoid clipping, the signal levels throughout the DrawingBoard must be adjusted such that the amplitude of the signal reaching the output WAV file is within the range -1 to +1. This is entirely the responsibility of the user since WaveWarp's flexible architecture offers complete freedom when manipulating signal levels. The Audio Limiter and Audio Normaliser components in the Dynamic Range Controllers category of the Component Library are useful for helping to avoid clipping. The Decibel Audio LED component in the Displays and Scopes category of the Component Library is a useful diagnostic tool for checking if clipping has occurred.

Note for MATLAB® users: the "wwmatlab" sub-directory of the WaveWarp root directory contains the necessary function m-files (plus example scripts) for reading and writing WAV files from within MATLAB, thus enabling the user to directly manipulate the individual samples of a WAV file off-line, and, furthermore, to create a WAV file from any sequence of numerical values.

Algorithm