My question is what method is behind the Spectrum edit mode in Pro version for realistically fine tuning the piano sound? Is it just about everything by hearing like "seems I like this more and this just not so"? Hardly believe so. Maybe some reading available about this? Some software such as Sony SpectraLayers or Izotope RX 5 could be used for analyzing or comparing with a real recorded note samples? And again even with "by hearing" method there should be at least some kind of procedure for it?