dropDouble interpolator

counter_t increment=42;
counter_t threshold=9001;
counter_t counter=0;
sample_t curSample=0;

sample_t dropDoubleInterpolateNextSample() {
    counter+=increment;
    while(counter>threshold) {
        counter-=threshold;
        curSample=readNextSample();
    }
    return curSample;
}