system
A chat on subreddit /r/wallstreetbets
human
What I'm hearing is that you want a MACD signal based on a higher timeframe but have the fast line on a slower/current timeframe. Correct? 
  
 'Independent of the interval length' still needs a length: it has to be based on at least something (phase of the Moon, etc). Multi interval MACDs are possible.

gpt
Correct exactly. Basically, 12-18 day MACD lines which are fixed while I can still toggle between 12/18 MACD lines which are variable based on my interval selection of say 15 minutes or 1 hour.