DPCM sample editor

There is a simple DPCM sample editor available from the DPCM instrument editor, it's intended mainly for trimming silent parts from the beginning and end of samples. Other types of edits should be done preferably before the sample is converted to DPCM.

Use the sample area to select a part of the sample and to set the start position (for preview).

- Delete
  Removes a part of the sample, select the part you wish to remove and press delete. This works best on the beginning and end of a sample; if you need to remove something in the middle then it's usually better to do this on the sample before you convert it to DPCM.
- Tilt
  Inserts zero-value samples inside a selected area, causing the sample to tilt toward zero. The idea is to restore the delta counter back to zero when the sample has finished, in order to restore volume for the triangle and noise channels.
- Center wave
  Draws the sample with an initial delta counter value of 64 in order to center the start of the wave. This is another method to keep the triangle and noise volume consistent, make sure all samples starts and ends at 64. The sample itself is not affected by this option, the equal operation in the tracker is to use the effect Z40 when playing the sample.
- Play
  Previews the sample at the selected pitch.

The offset value tells the start position (as used internally by the DPCM channel), this value can be used with the Yxx command. The pos value is the position in size units as used by the DPCM channel.

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