Teensy 4.1 Audio Synthesizer — PCB Layout, Firmware & Panel Files

I am designing an original experimental musical instrument — the Schmidt-Fajlik Linea — inspired by the idea of music as linear narrative, phrases that unfold like birdsong rather than loops. Full technical specification is attached. Scope: • Schematic + PCB layout (EasyEDA or KiCad), Gerber-ready for Seeed Fusion • Full firmware in Arduino/Teensyduino: virtual analog, FM, wavetable, granular, phrase sampler, looper, generative mode, Bluetooth MIDI, CV/Gate • Front and rear panel design files for Front Panel Express • BOM with LCSC part numbers Requirements: • Demonstrated Teensy 4.1 + Audio Shield experience — please share a relevant project • FM synthesis experience • Fixed price preferred, milestone payments • Please confirm familiarity with all scope items before bidding