Wired has an interesting interview; ‘How to mod a piano’ with the musician who goes by the name of Hauschka
Wired.com: Is there a way to categorize the modifications? Is it like, things that bounce and things that tamp the volume, or is it just a near infinite amount of possibility?
Bertelman: There are two different ways. One is, you put material on top of the strings that are bouncing or vibrating on top of the strings, so they are resonant on top of the string… If I’m playing an upright, it is different, because they are swinging, but if I’m playing a grand piano they are just flipping. So there is the piano tone plus vibration, which is one thing. And then I am using, for example, tape — like duct tape. With that, you can change the envelope of the tones. You can tamp them, or you can make them shorter — they sound just like pizzicato strings. I’m also using these felt things that piano tuners use to mute the note, you are familiar with that?
Wired.com: Yes.
Bertelman: It’s just things that you just clamp between the two strings to mute them. With that, they get a very, very short tone, and very percussive. So I would say these two things I’m using at the moment. But there’s more stuff coming on top of that. I’m using e-bows, which are normally used for electric guitar. Are you familiar with those?
Wired.com: Oh yes.
Bertelman: I’m using those on the piano, and they are great, because they create a kind of patch. I have a constant tone and can play on top of that. And I’m actually developing at the moment a couple of different machines, where I’m using little motors to have more of a constant vibration in the piano so that I can create carpets of sound.
Wired.com: Incredible.
Bertelman: The more you work with it, the more you want to have different options, and the more you don’t want to use other instruments. Just using this one, you get deeper and deeper into the instrument and what you can do with it. The piano offers, I would say, all the options that you would want to have.