[Elecraft] KPA1500 ATU band/bin operation

[Gary Slagel]

I'm thinking of replacing an old SPE amp with a KPA1500.
I have 4 antennas: 10/15/20 yagi, 40M yagi, 80/160 dipole and an all band hytower vertical so will probably have 3 switched antennas to one antenna port on the KPA1500 and 1 antenna to the 2nd antenna port.
After 'training' on all freq/antenna combinations I'll tend to have 2 or 3 settings for each freq/bin.   When I tune from one frequency to the next and one bin to the next bin, the tuner will have to select one of the 2 or 3 settings for the bin.  Does it wait until I transmit (a dit with the key) to select the new setting or will it track with the k3 and make changes as I move from freq to freq.   Will I notice the tuner trying each setting (lights flashing, relay noise) until it finds the correct setting? 
My older SPE has a similar freq/bin concept but has 4 antenna ports and 1 set of band/bins per antenna port.   This allows it to know exactly setting to use which is nice.   But... maybe not as durable as the KPA1500.
Thanks for any advice.
Gary SlagelKT0A