def centre():
    if o_enable == 0:
        led.unplot(2, 2)
        led.plot(4, 4 - range2)
    else:
        led.plot(2, 2)
        led.plot(4, 4 - range2)

def on_button_pressed_a():
    global o_enable, old
    if o_enable == 0:
        o_enable = 1
        old = 0
        led.plot(2, 2)
    else:
        o_enable = 0
        led.unplot(2, 2)
input.on_button_pressed(Button.A, on_button_pressed_a)

def pot_adjust():
    global freq, bin2, pct, indx2, old
    freq = 0
    bin2 = pins.analog_read_pin(AnalogPin.P1)
    pct = (bin2 - 1) / 1023 - 0.001
    if pct > 0:
        freq = max_range * pct
    if old > bin2 - 20 and old < bin2 + 20:
        clr_scrn()
        index2 = 0
        while index2 <= 9 * (pct * 1.25):
            indx2 = -4 + index2
            for index in range(5):
                led.plot(index, index - indx2)
            index2 += 1
    old = bin2
    centre()
def clr_scrn():
    global indx2
    index22 = 0
    while index22 <= 9 * (1 * 1.25):
        indx2 = -4 + index22
        for index3 in range(5):
            led.unplot(index3, index3 - indx2)
        index22 += 1
    centre()

def on_button_pressed_b():
    global range2, max_range
    range2 += 1
    if range2 > len(list2) - 1:
        range2 = 0
        led.unplot(4, 0)
        led.plot(4, 4)
    else:
        led.unplot(4, 4 - (range2 - 1))
        led.plot(4, 4 - range2)
    max_range = list2[range2]
input.on_button_pressed(Button.B, on_button_pressed_b)

def reset():
    global list2, max_range, xval, yval, value, xsig, ysig, scale, freq, range2, multiplier, o_enable
    list2 = [1000, 10000, 100000, 250000, 500000]
    max_range = list2[0]
    xval = 0
    yval = -1
    value = -1
    xsig = 3
    ysig = -1
    scale = -1
    freq = 0
    range2 = 0
    multiplier = 0
    o_enable = 0
    pins.analog_pitch(0, 0)
    music.ring_tone(0)
multiplier = 0
scale = 0
ysig = 0
xsig = 0
value = 0
yval = 0
xval = 0
list2: List[number] = []
indx2 = 0
max_range = 0
pct = 0
bin2 = 0
freq = 0
old = 0
range2 = 0
o_enable = 0
pins.analog_set_pitch_pin(AnalogPin.P0)
music.set_built_in_speaker_enabled(False)
basic.show_string("V_PGEN")
reset()
led.plot(4, 4)

def on_forever():
    if o_enable == 1:
        pot_adjust()
        if freq >= 1:
            music.ring_tone(freq)
        else:
            music.ring_tone(0)
    else:
        music.ring_tone(0)
basic.forever(on_forever)