Korg Electric Keyboard manual 115, Crossfade Loop

Crossfade Loop

When pitched instrumental samples such as strings or winds are looped to sustain a note, the sound will “jump” or “skip” repeatedly during playback if there is a significant difference between the waveforms at the loop start and loop end locations.

In order to solve such problems, Crossfade Loop causes the sound to change gradually from the end to the beginning of the loop.

Sound

Playback Repeated playback

(first half of loop) (second half of loop)

Gradually changes to first half

In actuality, the sample data is created as follows. A specific length (the “Crossfade Length”) of the waveform immedi- ately before the beginning of the loop is taken and mixed with the end portion.

At this time, the waveform level of the portion immediately before the end (the length specified by “Crossfade Length”) will gradually decrease, and the waveform level immedi- ately before the beginning of the loop will gradually increase as the two are mixed.

Loop	Loop	Loop	Loop
Start	End	Start	End

Crossfade

Length

Power: The volume will change non-linearly. Sometimes a setting of Linear will produce the impression that the volume has dropped in the middle of the curve. In such cases, use Power.

5In “Save to No.,” specify the save destination sample number. By default, an unused sample number will be selected. If “Overwrite” is checked, this cannot be set.

In the case of a stereo sample, the display will indicate “Save to No.(L)” and “Save to No.(R).” Specify the save destination sample numbers for the L channel and R channel respectively.

If you wish to delete the original sample data and over- write it with the edited sample data, check “Overwrite”. Normally, you will leave “Save to No.” at its default set- ting, and execute without checking “Overwrite.” (☞ p.99 “*1: About “Overwrite””)

6To execute Crossfade Loop, press the [F8] (“OK”) key. To cancel without executing, press the [F7] (“Cancel”) key.

4.1 3.1 2.1 1.1 SMPL

1Use “SMPL” (3.1–1b) to select the sample that you wish to crossfade.

2From the Edit2 page “UTILITY,” choose “Crossfade Loop” to open the following dialog box.

3In “Crossfade Length,” specify the length of the sample that you wish to crossfade.

If you set this as %, “Crossfade Length” will be calcu- lated automatically. Specify the proportion of the “Cross- fade Length” relative to the length between the loop start and loop end. If you set this to 50%, crossfade will be per- formed on the second half of the region between loop start and loop end.

If the length from the beginning of the sample to the loop start is shorter than the length from the loop start to the loop end, “Crossfade Length” can be set only up to the length from the beginning of the sample to the loop start. In this case, a setting of 100% will not be pos- sible.

4Set “Curve” to specify how the volume will change in the crossfaded region.

Linear: The volume will change linearly.

7.1 5.2 5.1

115