Reason gives you many ways to amplify and distort your tracks, but there are really only two kinds of distortion: intentional and unintentional.
Distortion occurs when a sound level exceeds the capacity of the line transmitting it. When this happens, its waveform peaks "clip," or level off, because they can't go any higher (Figure 8.44).
Figure 8.44. The left signal is at maximum and the right is clipping above maximum.
Unintentional clipping is never a good thing. Your level indicators will show red when your signal level exceeds the maximum.
Controlled distortion typically involves two volume controls that work together. The first (usually called the "gain") boosts the level internally and the second ("master" volume) controls the output separately.
The D-11 Foldback Distortion
The D-11 is a shaping tool that works on clipping. The Amount knob boosts the signal and the Foldback knob dulls or sharpens the clipping angle, directly affecting how harsh (sharp) or smooth (rounded) the distortion is.
Distorted signals seldom benefit from a dry/wet mix. For this reason distortion is primarily used either as an insert effect or with Pre-fader sends.
To create a D-11 insert effect