- Keep 44.1kHz native sample rate to avoid linear resampler alias noise
- MIC_BOOST 300%% (3x) with clipping, after filtering per user request
- Low-pass 0.25 (~2.5kHz) to remove MCLK high-pitch hiss
- High-pass 0.985 (~100Hz) to remove DC/rumble/pop
- Chain: raw -> high-pass -> low-pass -> boost
- Disable FM8002E speaker amp GPIO1 during recording (active-low) to eliminate pop/hiss, re-enable after
- Add esp_driver_gpio requirement for gpio_set_level
- Previous UI improvements (date+duration list, green highlight, volume slider, full-screen layout) included in history
Adolfo
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