Need help understanding how plane cannons are coded, please share if you know answer to question

Trying to understand game mechanics a bit more, and was looking at plane armaments. In the data sheets it will list multiple types of ammo for a plane’s cannon.

Example: on the premmy ki-61 Hei plane it says it has
I-T|I-T|APHE|HEI for the 20mm cannons. How does this work? Is each bullet coded to be all of them at once? Does it alternate ammo type as it fires?

It cycles through

First round in belt: Incindiary Tracer
Second round in belt: Incindiary Tracer
Third round in belt: Armor Piercing High explosive
Fourth round in belt: High Explosive Incindiary.

Cycle starts again.

If its anything like warthunder (mostly likely is), The first round in belt determine the bullet velocity of all rounds, regardless of their individual stats.

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I appreciate your time answering. Thanks