code: async def set_volume(self, vol: int):
          
          if self._lavalink._server_version <= 2:
              self.volume = max(min(vol, 150), 0)
          else:
              self.volume = max(min(vol, 1000), 0)
          await self._lavalink.ws.send(op='volume', guildId=self.guild_id, volume=self.volume)
docs: Sets the player's volume (150% or 1000% limit imposed by lavalink depending on the version).