Product Introduction
This is a standalone harmonically based instrument built on the circle of fifths. Its sound engine is derived from the harmonic series, enabling precise control over timbre across seven distinct harmonics. It provides a highly expressive synthesis experience with deep tonal shaping capabilities.

Product Features
🎛️ Harmonic Series Sound Engine
Generates sound based on the harmonic series for rich and musically structured tonal output.
🎚️ Advanced Oscillator Timbre Control
Each oscillator can be customized using a dedicated button, horizontal slider, and side knob for detailed sound shaping.
🎼 Built-in FM Modulation System
All seven oscillators include frequency modulation models with selectable FM ratios for expanded sonic design.

Product Specifications
- Product Name: Harmonic Circle of Fifths Synthesizer Instrument
- Sound System: Harmonic series-based synthesis engine
- Oscillators: 7 independent harmonic oscillators
- Control System: Button + slider + knob multi-control interface
- Modulation: Built-in FM synthesis with selectable ratios
- Reset Function: Counter-clockwise knob reset to pure sine wave

Packaging Includes
- 1 × Harmonic Circle of Fifths Synthesizer Instrument
- 1 × User Manual
✨ Shape sound with precision and unlock limitless harmonic creativity!