Importing DPCM samples

This feature is used to convert Microsoft wave files (.wav) to 1-bit DPCM samples, as used by the NES hardware's sample channel. The format of the wave files must be PCM, no compressed formats are supported. Sample rate, sample size and channel count doesn't matter, the file will be resampled according to the quality setting.

Choose import in the DPCM instrument editor dialog, select a file and you will be asked to select a quality and volume setting:

- Quality
  Sets the sample rate for the converted sample, this is equivalent to the pitch setting in the instrument editor. Use the same setting to play the sample at original pitch. Quality of 15 gives best result but also shortest sample time.
- Gain
  Sets the conversion volume level. Range: -12dB to +12dB.

Maximum supported size of one DPCM sample is 4 kB, at quality 15 (33 kHz) it's a little less than one second and lowest quality (4 kHz) about eight seconds.

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