copySampleValue_( index ) {

		// copies a sample value to the result buffer

		const result = this.resultBuffer,
			values = this.sampleValues,
			stride = this.valueSize,
			offset = index * stride;

		for ( let i = 0; i !== stride; ++ i ) {

			result[ i ] = values[ offset + i ];

		}

		return result;

	}
Copies a sample value to the result buffer.

@param {number} index - An index into the sample value buffer.
@return {TypedArray} The result buffer.