This is just a quick demonstration of the Cooler Master Quick Fire Rapid-i in action, regarding likely polling rate and chord splitting. This video showcases the board only in USB mode, as it is incompatible with PS/2 dongles.

The program used is an input test program, which can be found here: https://github.com/ad8e/input-polling-test

I kinda blaze through this for the sake of brevity on the user end, but I assure you that I've done lots of prior testing with these keyboards both with the program and within Etterna as well to cross check the data (technically this program is the secondary source).

Rhythm game oriented board list (please note that many of these boards I do not own, and as such there will be no videos like this on them): https://docs.google.com/spreadsheets/d/1hNMXn_nkpXZIpDHZBcp95E7OweL4594_WDLCY_vTvm0/

BGM is Discovery by Chris Collins, for which I purchased the royalty free license for: indiemusicbox.com