Body-Model Factoring

In commuted synthesis, it is often helpful to factor out the least damped resonances in the body model for implementation in parametric form (e.g., as second-order filters, or ``biquads''). The advantages of this are manifold, including the following:

• The excitation table is shortened (now containing only the most damped modes).
  
• The parametric resonances can be modulated for interesting effects.
  
• Multiple body outputs become available from the parametric filters.

Techniques for carrying out this factorization in practice are discussed in Appendix R [230].