"How would you reckon the chip will work on say a grand piano with such size? Stick the instrument chip on the body, external, internal, on some keys. seems to complex to grasp where it would have its effect."
Take something relatively simple, say a flute. How does the chip affect the sound? I.e., what is the operating mechanism? Or a bass drum - what would be the operating mechanism?
Take something relatively simple, say a flute. How does the chip affect the sound? I.e., what is the operating mechanism? Or a bass drum - what would be the operating mechanism?