I'm creating abstracts of DPW oscillators according to Välimäki's paper from 2010.
He proposes the DPW in different orders. (1st, 2nd ... 6th) to reduce the aliasing of digital oscillators. the 1st to 4th order models work absolutely fine but the 5th and 6th order version get heavily distorted if I go below frequencies of 200Hz (for the 5th-order version) and 600Hz (for the 6th order verision).
Does anyone know why? Did I do something wrong in the patch?