The code (1)

class SimVizGUI:
    def __init__(self, parent):
        """build the GUI"""
        self.parent = parent
        ...
        self.p = {}  # holds all Tkinter variables
        self.p['m'] = DoubleVar(); self.p['m'].set(1.0)
        self.slider(slider_frame, self.p['m'], 0, 5, 'm')
        
        self.p['b'] = DoubleVar(); self.p['b'].set(0.7)
        self.slider(slider_frame, self.p['b'], 0, 2, 'b')

        self.p['c'] = DoubleVar(); self.p['c'].set(5.0)
        self.slider(slider_frame, self.p['c'], 0, 20, 'c')