如何在加入语音通道的discord.py机器人之间添加暂停？

import discord
from discord.ext import commands

bot = commands.Bot(command_prefix='!')

@bot.event
async def on_ready():
    print(f'Logged in as {bot.user.name}')

@bot.command()
async def join(ctx):
    channel = ctx.author.voice.channel
    voice_client = await channel.connect()

@bot.command()
async def pause(ctx):
    voice_client = discord.utils.get(bot.voice_clients, guild=ctx.guild)
    if voice_client.is_playing():
        voice_client.pause()

@bot.command()
async def resume(ctx):
    voice_client = discord.utils.get(bot.voice_clients, guild=ctx.guild)
    if voice_client.is_paused():
        voice_client.resume()

@bot.command()
async def leave(ctx):
    voice_client = discord.utils.get(bot.voice_clients, guild=ctx.guild)
    if voice_client.is_connected():
        await voice_client.disconnect()

bot.run('YOUR_BOT_TOKEN')