Yes, the transition is very smooth on the X1 as well. There is only one stipulation: When you press # 4 (for 004) it takes the keyboard about 2 seconds to understand that this is a 1 digit number entered. Usually the O.S. expects you to press 3 digits (which is the full length of the 3 digits registration), when you press only one digit, it gives you a chance of 2 seconds to continue, if you don’t press anything, it translates your input as a 3 digits number (by adding 2 Zeros to the left) and executes it.
However, if you press 004, the registration change is done instantly.
Don’t forget that you can always use the footswitch to change registrations up & down instantly.
N.B. All of the previous apply only on the X1, I don’t know if it also applies on the SD1.
Regards,
Maged