// ----- thick_distortion
b.openHorizontalhideBox("");
b.create_master_slider("thick_distortion.volume", _(" Volume "));
b.closeBox();
b.openHorizontalBox("");
{
    b.create_small_rackknobr(
        "thick_distortion.input_gain", _(" Input Gain "));
    b.create_small_rackknobr(
        "thick_distortion.thickness", _(" Thickness "));
    b.create_small_rackknobr(
        "thick_distortion.volume", _(" Volume "));
}
b.closeBox();
