Suddenly I find that I require a patch that incorporates feedback. The goal is to implement a biquad filter given by the difference eqn y(n) = Ax(n) + Bx(n-1) + Cx(n-2) - Dy(n-1) - Ey(n-2).
I have approached this with the use of delay~ objects to get the lsat two sample values for the input and output signals. This requires a feedback loop in the patch which is apparently impossible. MSP seems to detect this configuration and disable audio. Is there a way to patch objects in a feedback configuration?
I know that the implementation of a filter as a max patch may not be possible, but I'm stuck on this feedback issue at the moment.