Modern casino slot machine games are controlled by computer software, and the win %s are preprogrammed into the software.
Casino slot games have Random # Generators which are continually generating combos, even when the slot machine game is not currently being played.
Running jointly with the RNG of the casino slot machine is the payout %.
The pay out percent controls how much the one-armed bandit will pay, for eg the pay percent may be 90%, meaning the slot machine game will payout ninety percent of all the bets played, and the casino will then get to keep 10 percent.
This is not to say that each time you bet ten credits you will receive 9 in return – where is the fun and thrill in that? Instead, the casino slot machine just will not pay out for a while, and then suddenly start up a hot streak and you might draw the big jackpot.
The profit %s usually will vary between the a variety of games and several of the highly popular casinos, e.g. Golden Online Casino, which tenders a pay out of up to ninety-five per cent!
Hence, in essence, the slot machine game takes all the currency played into it and pays it out to a couple of fortunate winners. The casino only gets to keep a fairly tiny percentage of all the plays allocated.
The casino slot machine software controls any part of the machine, from the flickering lights to the rotating of the reels.
When you hit spin on the slot machine, a combination is developed by the RNG which relates to the pictures on the reel.