Version v3.3 contains the following: • Bug fixes. • Redesigned Multilayered Structure Builder • New enhanced room acoustics calculations In brief, beyond the usual bug fixes we have made some usability enhancements on the Multilayered Structure Builder and we have introduced a new hybrid algorithm for the calculation of the room acoustics parameters. The new algorithm is much simpler to use since it doesn't require complicated termination criteria to be set by the user, while it also features an "Auto" mode which works well for most of the cases.