When tempo knob or song list was changed, starting at next 1st tempo

when I change tempo knob or next song on set list, Tempo is changed on the instant at that time. but It is need to change tempo at next 1st tempo, whenever I have changed before 4bit. In the Live concert or any Live environment, tempo can be changed several times, especially in the recently music. But, becase there are so many variable in music or Live concert except for my situation, It is best to make let user select time that they want to change tempo.

Changed the title from "when tempo knob or song list was changed, starting at next 1st tempo" to "App: when tempo knob or song list was changed, starting at next 1st tempo"

Hey, sorry I have a bit difficulty to understand your suggestion. Do you mean that after changing to the next song in a setlist, instead of instantly changing the tempo, you want the current bar to complete first, and then the tempo changes with the first beat of the next bar?