Revert TTS output filter tuning after reverting the Pico 1.1.0.2

    // Such a huge filter gain is justified by how much energy in the low frequencies is "wasted" at

    // the output of the synthesis. The low shelving filter removes it, leaving room for

    // amplification.

    private final static float PICO_FILTER_GAIN = 4.0f; // linear gain

    private final static float PICO_FILTER_LOWSHELF_ATTENUATION = -16.0f; // in dB

    private final static float PICO_FILTER_TRANSITION_FREQ = 1000.0f;     // in Hz

    private final static float PICO_FILTER_GAIN = 5.0f; // linear gain

    private final static float PICO_FILTER_LOWSHELF_ATTENUATION = -18.0f; // in dB

    private final static float PICO_FILTER_TRANSITION_FREQ = 1100.0f;     // in Hz

    private final static float PICO_FILTER_SHELF_SLOPE = 1.0f;            // Q

    //