Modern casino slot machines are controlled by computer chips and software, and the win %s are preprogrammed into the gaming software.
Casino slot games have Random Number Generators that are ceaselessly generating combinations, even when the machine is not currently being played.
Running synchronously with the Random Number Generator of the casino slot machine is the pay out rate percentage.
The pay out % controls just how much the slot machine game will pay out, for eg the payout % may be ninety per cent, meaning the slot game will pay 90% of all the wagers played, … the casino simply gets to keep ten percent.
This does not mean that every time you bet 10 credits you will receive 9 in return – where is the fun and fascination in that? Instead, the casino one arm bandit will not payout for a bit, and then suddenly go on a hot streak and you might hit a big top prize.
The payoff %s will tend to vary between the a variety of games and a handful of the very famous casinos, e.g. Golden Online Casino, which offers a payment of up to 95 percentage!
So, in essence, the slot machine takes all the $$$$$ played into it and pays it out to a couple of fortunate winners. The casino only gets to keep a relatively petite % of all the bets made.
The casino slot machine software controls each and every part of the machine, from the blinking lights to the rolling of the reels.
When you hit spin on the slot machine, a combination is produced by the RNG which relates to the pictures on the reel.

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