First of all the main idea of this script is from Mr.sixamo who is one of the most talented technical trader in Japan.
For the purpose of creating this script is to support scalpers or traders who are planning to trade within one day, so Multi RSI and Multi BB show current leg, 15 min leg, 60 min leg, and 240 min leg values. Due to the limitation of pine script, both script should be applied only current leg or longer. Therefore, for example, when you open 60 min leg chart, only current min, 60 min, 240 min leg value will be shown and this logic cannot be changed never until pine will be upgraded.
Anyway, I hope this will be helpful for all of short-term trader.
HAVE A FUN!