@CRH Samplitude Music Studio X8 is based on Samplitude Pro X8. Music Studio versions 2024 and earlier had a different code base and a different mastering chain compared to the Pro X versions.
You now need to select the mastering plugins you want to use via the plugin slots of the Master Bus in the Mixer window.
@CRH You're correct, the auto mastering suite of Music Maker is not included in Music Studio X8. You have the options I mentioned above or use an older version of Music Studio/Music Maker to master your songs.
Exactly, the previous automastering from the Music Maker has been replaced by a professional mastering chain in version "Music Studio X8". But since we can understand the call for a more automatic mastering for the Music Studio software, we have thought of something special for version X9, so stay tuned.