Modern casino slot machine games are controlled by a computer, and the win %s are pre-programmed into the software.
Casino Slots have Random # Generators which are ceaselessly generating combos, even when the game is not active.
Running in unison with the Random Number Generator of the casino slot machine game is the pay out rate percentage.
The pay out percentage controls how much the one-armed bandit will pay out, for eg the pay out percentage may be ninety percent, which means the slot machine will payout ninety percent of all the bets played, and the casino will then get to keep ten percent.
This is not to say that each and every time you bet ten credits you will receive nine in return – where is the fun … thrill in that? Instead, the casino slot machine just will not pay out for a bit, and then suddenly go on a hot streak and you might draw the big pot prize.
The payout percentages usually will vary between the differing games and some of the very popular casinos, for example Golden Online Casino, which puts forth a pay out of up to ninety five percent!
Hence, in essence, the one-armed bandit takes all the $$$$$ played into it and pays it out to a few privileged winners. The casino only gets to keep a basically tiny per cent of all the wagers allotted.
The casino slot software controls each and every part of the machine, from the blinking lights to the revolving of the reels.
When you hit spin on the slot machine game, a combination is put together by the RNG which corresponds to the pictures on the reel.