@commands.command(name='volume', aliases=['vol'])
async def volume(self, ctx, volume: int=None):
    player = self.bot.lavalink.player_manager.get(ctx.guild.id)
    if (not volume):
        return (await ctx.send(f'🔈 | {player.volume}%'))
    (await player.set_volume(volume))
    (await ctx.send(f'🔈 | Set to {player.volume}%'))
@commands.command(name='volume', aliases=['vol'])
async def volume(self, ctx, volume: int=None):
    player = self.bot.lavalink.player_manager.get(ctx.guild.id)
    if (not volume):
        return (await ctx.send(f'🔈 | {player.volume}%'))
    (await player.set_volume(volume))
    (await ctx.send(f'🔈 | Set to {player.volume}%'))