Using the Soundtoys 5.4 Bundle is easy. First, install the bundle on your audio system. Then, open your audio editing software and find the plugins in the plugin list. You can add them to your tracks to enhance the sound. When using each plugin, adjust the knobs and sliders according to your needs to get the desired effect. As for maintenance, keep your software up - to - date to ensure the best performance. Make sure your computer has enough storage and processing power. Also, back up your projects regularly in case of any issues. Don't overload your system by using too many plugins at once, as this might cause lag.