Playing an wav audio file on button press with "Feather RP2040 Prop-Maker" (update Debounce)

code.py

import supervisor
supervisor.set_next_code_file(None, reload_on_error=True)

import board
import audiocore
import audiobusio
import audiomixer
from digitalio import DigitalInOut, Direction, Pull

from adafruit_debouncer import Debouncer

# enable external power pin to provides power to the external components
external_power = DigitalInOut(board.EXTERNAL_POWER)
external_power.direction = Direction.OUTPUT
external_power.value = True

# i2s playback
level_play = 0.5
wave_file = open("Merry-Xmas-Piano.wav", "rb")
wave = audiocore.WaveFile(wave_file)
audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)
mixer = audiomixer.Mixer(voice_count=1, sample_rate=22050, channel_count=1, bits_per_sample=16, samples_signed=True)
mixer.voice[0].level = 0
audio.play(mixer)

# servo control
play_ringtone = False

# boot button
switch = DigitalInOut(board.BUTTON)
switch.direction = Direction.INPUT
switch.pull = Pull.UP

# external button
switch_ext_ = DigitalInOut(board.EXTERNAL_BUTTON)
switch_ext_.direction = Direction.INPUT
switch_ext_.pull = Pull.UP

# Make the external switch a debounced switch with minimum 50 ms
switch_ext = Debouncer(switch_ext_, interval=0.05)

switch_state = False

while True:
    if play_ringtone:
        if not(mixer.voice[0].playing):
            play_ringtone = False
            mixer.voice[0].level = 0.0
            print("Stopped playing")
    else:
        if (not switch.value or not switch_ext.value) and switch_state is False:
            play_ringtone = True
            switch_state = True
            mixer.voice[0].play(wave, loop=False)
            mixer.voice[0].level = level_play
            print("Starting playing")
    if (switch.value or switch_ext.value) and switch_state is True:
        switch_state = False

This piece of code just play a wave file completely once when someone press the "boot" button (for testing) or the "external" button.
It is then ready to play it again at the next press.

This is used as a xmas ring music for a doorbell.
This can be connected to a button on the front door, however I use it with a relay activated by that doorbell button.

On multiple occasion, the Xmas sound started, so I added a 50ms debounce on the external button.
I don't know yet how effective it is, should it be shorter or longer???