Selecting a part of the waveform usually results in a contiguous selection, starting where you clicked the mouse up to the point where you released it.
A non-contiguous selection can be thought of as being composed of several simple selections, several regions are selected simultaneously. Here is how a non-contiguous selection can look like:

Although TwistedWave has [...]

Manually cutting a long file into many different parts, and saving them as individual files can be very tedious and quickly take a lot of time. In this article, I will demonstrate how easily this can be done with TwistedWave, thanks to the built-in silence detector.
Detecting the silences
When you want to split an audio file, [...]

A new update is now available, TwistedWave1.6.3.dmg.
It contains a few new features and a bug fix, as described below:
Change the pitch and speed
As a replacement for the old “Change Speed” effect, you now have the “Change Pitch and Speed” effect. In addition to changing the speed of your audio, you can now alter its pitch, [...]

Bug fix
By mistake, I have introduced a small bug in TwistedWave 1.6.1.
Namely, some Audio Unit Plugins, or the “Change Speed” effect can
freeze TwistedWave when they are applied. Fortunately, I could fix it
as soon I as was aware of the problem. The correction is now available
in TwistedWave 1.6.2.
Custom Fade
In addition to a bug fix, the 1.6.2 [...]

Here is the list of new features and improvements from the release notes:
New Features

Support for metadata.
Added a signal generator.
A configurable special pasting that automatically fades in/out.
Added an icon for the files saved by TwistedWave.
Added the ability to export the selection.
Added the ability to create a new document with the current selection.
Added [...]

From the release notes:
New Features

Added the ability to move the cursor to the next transient.
Saving OGG/Vorbis files (only reading was available).
Reading WMA files.
Added the ability to disable the automatic scrolling when playing.
Added the insert silence effect.

Fixes and Improvements

Improved the audio units management.
When loading a split multichannel file, the document name was Untitled.
The audio [...]

Along with the ‘New’, ‘Open’, ‘Save’ and other commands you usually find in the ‘File’ menu, you may not have noticed the ‘Duplicate Document’ item. How useful could that be? Don’t you get a duplicate document just by saving it with another name?
Working on an audio document often involves many steps, copy/pasting, applying several effects… [...]

From the release notes:
New Features

Ready for Leopard!
Reading/Writing FLAC files.
Reading OGG/Vorbis files.
Saving CAF files.
It is possible to choose the sample size, bit rate and codec when saving a file.
Added the cursor position and (optional) selection length in the toolbar.
Added two dialogs for editing the cursor position and selection.
Added the ability to reorder the channels.
The file [...]

Editing a sound file consists mainly in copy/pasting and applying effects. Although TwistedWave lets you copy and paste bits of the sound file around in no time, applying a sound effect affects every sample, and takes more and more time as the file gets longer.
Repeatedly applying effects on a long file becomes a very tedious [...]