Scale Atlas

Develop a mobile world music discovery application centered on cross-cultural musical scale exploration, with core functions structured as follows. First, build a complete database covering musical scales from diverse cultures and regions across the globe, including detailed basic structure descriptions for each traditional musical system, such as pentatonic scales from East Asia, raga scales from South Asia, and modal scales from European folk traditions. Second, design a smooth switching interaction that allows users to seamlessly toggle between different musical traditions, with all core parameters of corresponding scales loaded in real time to avoid operation lag. Third, implement a real-time melody transformation and playback module, support users to either select pre-provided standard simple melodies or upload short audio clips, automatically convert the input melody into the mode of the currently selected musical tradition, and achieve instant side-by-side playback of the original melody and the transformed version, so that users can intuitively perceive the unique tonal differences brought by different scales. Optimize the audio output latency to be less than 100 milliseconds to ensure the fluency of comparative listening experience. Add a friendly guide entry on the home page to quickly lead new users to understand the usage logic, set a lightweight interactive mode to avoid complex operation steps, and ensure that users can quickly start to explore the unique charm of world music scales. The overall interface style should be simple and clear, with cultural characteristic elements integrated appropriately, and the audio playback control should be set in a prominent position to facilitate users to operate and compare at any time. The app should run stably on mainstream mobile devices, with clear audio output and no abnormal noise during the mode switching and melody transformation process, to provide users with a convenient and intuitive experience of exploring diverse musical cultures from around the world.