On Tue, Jan 28, 2003 at 09:49:23 +0100, David Olofson wrote: > Thoughts? Any ideas for useful cross feedback configurations?
One of the waveguide papers gives the maths to use for stable feedback matrix values, its pretty obvious from what I remember, just make |A| = 1.0. Adding an allpass at the junctions will make it sound smoother. I have a perl script that can create arbitrary matrixes + filters + delay lines from a description of the surface network, which is how I built the gong and plate reverb models. Interesting surface shapes (eg. bow tie) can produce interesting (and quite predictable) sonic results. You have to be careful because some of this stuff is covered by the Karplus/Stanford/Yamaha patents. IIRC non commercial use is allowed. - Steve
