I need a push bottom instead of a check bottom that will allow me to set the manipulate variables to specific values. In th ecode below, need bottom t1 that will set .
ClearAll["Global`*"]
Manipulate[
DensityPlot3D[
z + y + Sec[x - Pi/6], {x, -2 - Pi*f1, 2 Pi}, {y, -2 - Pi*f2,
2 Pi}, {z, -2 - Pi*f3, 2 Pi}],
{{f1, If[t1, 2.5, 1.5]}, 0, 10},
{{f2, 1.5}, 0, 10},
{{f3, 1.5}, 0, 10},
{t1, {True, False}}
]