I had to turn the music off as it got repetitive, but the rest of the audio stays on. The sound effects are so satisfying as everything is counted after playing a hand and you've got a bunch of jokers and cards triggering and then flames begin to build up.
The music is pretty great but I think they're really talking about the diegetic sound effects. When you get a multiplier the pitch rises for each new mult, but no matter how many you get it never goes sky high I think it uses some version of the infinite stairs effect.