return {
    {
        gain = 0,
        name = 'preamp',
    },
    {
        name = 'lowpass',
        Q = 1.0592466885951,
        frequency = 21999.001882544,
    },
    {
        gain = 0,
        name = 'eq',
        Q = 0.5,
        frequency = 500,
    },
}