Maybe my post from general arranger is also on topic here.

The criteria of semi pro or pro musicians are quite different to the home player. For them a harmoniser is important because they can save money on a Digitech or Prism, even if the Yamaha harmoniser is not the equivalent, it may very well be good enough for the job, and another box does not have to be carried and connected up, and the wires go wrong. The Technics harmoniser is not good enough. For many home players a harmoniser gets tried out at Xmas or a party and then forgotten about. Thus Technics don't spend money on a chip and patent license, they use a dsp.

It all depends where you decide to spend the money in design and whether the function is worth it, i.e. going to be used by the majority of your market, I suppose.