Change tempo using the scale

9_change_tempo_part.py

# Variable for the scale value
scale_var = tk.IntVar(midFrame)

# When scale changes 
def update(*args):
    global scale_var, time_signature, interval_ms, tempo
    tempo = scale_var.get()
    interval_ms = int((60/tempo) * (4/time_signature[-1]) * 1000)

# Use a scale to show the tempo range
scale = tk.Scale(midFrame,
             from_=tempo_range[0],
             to= tempo_range[1],
             orient=tk.HORIZONTAL,
             length=defaults['scale_length'],
             showvalue=0,
             troughcolor = theme_colors['scale_through'],
             bd = 0,
             activebackground = theme_colors['text'],
             bg = theme_colors['label_bg'],
             sliderlength = 30,
             font=(theme_fonts[0]),
             variable=scale_var,
             command=update)
scale.set(defaults['tempo'])
scale.pack(side='bottom',fill='both', expand='0')

Very nice job Huang.

I have run through previous scripts until this file "9_change_tempo_part.py " , then I had a few errors,

Below are the with error : Cannot find reference '' in 'init.py'
scale_var = tk.IntVar(midFrame)
tempo = scale_var.get()
scale = tk.Scale(.....)
orient=tk.HORIZONTAL

Below are error: global variable 'time_signature' is undefined at the module level
global scale_var, time_signature, interval_ms, tempo

Do you have any suggestions?

Thanks.