This:
texture {
    gradient y
    texture_map {
        [0.9  robot_texture]
        [0.9  GasketTexture]
    }
    scale 0.5
}
will scale the entire texture by 0.5, robot_texture and GasketTexture
are now parts of the texture being scaled, and are scaled with it. Using
frequency 2 in it's place will just affect how those textures are used,
and not their scale.
As for turbulence, if you enclose it in a warp {} statement, it acts
like any other transform, and is dependant on position.
Are you trying to scale the pattern, but not the stuff being patterned?

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