Reverse Counter

Link to multisim: https://drive.google.com/file/d/1x9opeUGng4dCmdqOMfNmrlk04gG9uV3s/view?usp=sharing

This is a reverse counter that I created by rippling the clock into the Least Significant Bit (LSB) first and then the outputs being inputted into the clock input of the next T flip flop until it reaches the Most Significant Bit (MSB). This counts down from 15 seconds to 0, and there is a DIP switch attached to it, which helps to lock it to count down from 7 seconds if the top is on, 3 seconds if the second one is on, and then just switches from 1 to 0 if the third one is on. If the last one is on then nothing happens it just stays on throughout the simulation.
The way I made this work is by putting XOR gates before each led because I know that an XOR will only output a 1 if the inputs are different, and if the DIP switch is off, the led will follow the regular 15 counter, but if the DIP switch is on, it will change according to which switch was flipped on. But if the second, third, or fourth switch is flipped on, anything above it would end up being don't cares, since they are always off. Below is a video of how the circuit works.