I'm a product design student. I'm not familiar with the terminal or writing code. Please build this for me with HTML, CSS, JavaScript and native Web Audio. Make a simple, usable browser page, with no external libraries or internet services. Sound should start only after I click. Use comfortable initial levels. I need to play with the result, not read code. Build a basic vocoder experiment. Analyse the energy in frequency bands of one sound and use it to shape another sound. I need to hear the modulator, the carrier and the result separately. Use a generated rhythmic modulator and a generated sustained carrier so it works without a microphone or downloaded files. Let me optionally import a voice recording as the modulator. Include band, speed or sensitivity controls that make sense. Say clearly what each input does. I want to hear the rhythm and changing frequency shape transfer to the carrier.