### Basic info - Commit SHA: 86862b41f74a0681eda2d0aae80985cac43e3601 - Platform: all ### Bug description Using a too low epsilon in a step of the covariance synthesis for ParamMC, to be precise in the regularized inverse of Kx, can lead to bursts for very low signals in the synthesis. Original Signal  Decoded Signal (ParamMC@80 kbps SWB)  ### Ways to reproduce (Clear steps or refer to a failing automated test, e.g. with a pipeline link) <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary. -->