There have been experiments to increase the volume and flexibility of the recorder, e.g. Mollenhauer's Modern Recorder[0], sometimes called the Harmonic Recorde

There have been experiments to increase the volume and flexibility of the recorder, e.g. Mollenhauer's Modern Recorder[0], sometimes called the Harmonic Recorder. [0]: https://www.mollenhauer.com/en/catalog/recorders/series-overview/modern-soprano-alto https://www.mollenhauer.com/en/catalog/recorders/series-over...