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 [...]

TwistedWave 1.8 was just released. The detailed list of new features, fixes and improvements can be found in the release notes. It can be downloaded from the home page. The main new features being the availability of a 64-bit version of TwistedWave, automatically splitting a sound file by detecting silences, and the ability [...]

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, [...]