Artificial Intelligence and browser-based multimedia technologies are transforming digital music production and interactive entertainment. This paper presents AI-Musical Keyboard (Pro-Synth), a lightweight web-based intelligent musical keyboard developed using HTML5, CSS3, JavaScript ES6, Web Audio API, Canvas API, and MediaRecorder API. The proposed system enables real-time digital sound synthesis directly within modern web browsers without requiring dedicated hardware or external software installations. The platform supports multiple virtual instruments including Acoustic Grand Piano, Organ, Harmonium, and Indian Sanai using Frequency Modulation (FM) synthesis, waveform manipulation, harmonic layering, and Low-Frequency Oscillator (LFO) modulation. The system also supports polyphonic playback, live audio visualization, recording, and downloadable audio export. AI-inspired functionalities such as chord suggestion, harmonic assistance, adaptive note highlighting, and pattern analysis improve musical learning and interaction. Experimental analysis demonstrates low-latency audio generation with efficient browser compatibility and lightweight offline-capable performance.

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Keywords— Artificial Intelligence; Web Audio API; Digital Audio Workstation; FM Synthesis; Polyphonic Playback; Browser-Based Synthesizer