transformation device and where more than one note can be assigned to a given pad (note) on the MIDI keyboard; velocity crossfading may be available. These types of crossfades (those that are based on note velocity) allow two (even more) samples to be assigned to one note or range of notes. This requires both a loud and soft sample; the reason for this is Timbre change. This type of crossfade is quite subtle depending on the proportion of the received note velocity value of the loud and soft sample. Crossfading usually involves the sounding of a combination of one or two sounds at the same time. While crossfading one does not want the second part of the fade to start playing before the first part is finished; one wants the overlapping parts to be as short as possible. If edit regions are not trimmed to a zero-crossing point one will get unwelcome pops in the middle. A sound at the lowest velocity can fade into a sound of a higher velocity, in the order of: first the first sound then the second. All possible without fading out the sounds that are already present. This in turn is a form of Layering that can be used in the mix. The same effect (as was created with velocity) can be applied to a controller. This allows continued monitored control; the crossfading function can also be controlled on some instruments by the keyboard position. These sounds on the MIDI keyboard can be programmed. A crossfade can either be used between two unrelated pieces of music or between two sounds that are similar; in both of these cases, one would like the sound to be one continuous sound without any bumps. When applying a crossfade between two very different pieces of music (relating to both tone and pitch), one could simply use a crossfade between the two pieces, make a few minor adjustments. This is because the two sounds are different from one another. In the case of a crossfade between two sounds, that are similar, phase-cancellation can become an issue. The two sounds that are crossfaded should be brought into comparison with one another. If both sounds are moving upward they will have a cumulative effect - when added together, this is what one wants. What is not desirable is when both sounds are moving in a different direction, since this can lead