What is the role of the user-defined presets in the S6000?

User-defined presets in the S6000 play a crucial role in enabling users to store customized effect configurations tailored to their specific needs and preferences. This feature allows users to save their unique combinations of effects, parameters, and settings, which can then be easily recalled during projects or live performances. This flexibility is paramount for audio engineers and producers who require quick access to their preferred setups without having to reconfigure everything from scratch each time.

In contrast, the other options don't accurately represent the function of user-defined presets. Limiting user access to effects is more about permissions and security rather than customization. Creating generic settings for all users does not capitalize on the S6000's capability for personalization, and providing tutorials for new users focuses on education rather than the practical application of effects in sound design. Therefore, the primary purpose of user-defined presets is indeed to facilitate the storage of customized effect configurations.