src/main/java/net/sourceforge/jaad/aac/gain/GainControl.java
private int getGainChangePointID(int lngain) {
		for(int i = 0; i<ID_GAIN; i++) {
			if(lngain==LN_GAIN[i]) return i;
		}
		return 0; //shouldn't happen
	}
private int getGainChangePointID(int lngain) {
		for(int i = 0; i<ID_GAIN; i++) {
			if(lngain==LN_GAIN[i]) return i;
		}
		return 0; //shouldn't happen
	}
transformes the exponent value of the gain to the id of the gain change
point