Have a gate that swings by the chute. For instance, if it is a 12 foot gate, the hinges of the gate would be 13-14 foot from the front of the chute and the gate would swing past and the calves would go left or right. If your chute has a side exit, you have a third sorting option right there as well.
I saw a setup all under cover in the Klamath area. The guy had this gate in front of his chute plus the gates down either lane were tied back to the chute area with a system of ropes and pulleys. He could open several on down the way from the chute. I don't remember the latch or the specifics. It was 13 years ago.