Like @joosep described: with the master transpose track.
You have to input the transposition values live or via step in the master transpose track, and also have the desired tracks transpose-enabled.
There’s a downside though: you can only have 1 (master) transpose track, so all transpose-enabled tracks transpose in exactly the same amount on exactly the same time.
Better would be that there’s a per-track option for transposing, so you can do different transpostions on a per-track basis.
I already requested this @squarpadmin in a previous topic somewhere.
hope this helps