change the slider to pick the different timer modes pc clock wait block frame counter the blue timer thing in the sensing category
some interesting stuff happens with turbo mode and frame clock. scratch projects *usually* run at 30fps, so the frame clock works by starting a timer that counts up 1 every frame until it reaches 30, then resets the clock, and steps the cat forward. turbo mode makes the fps incredibly high. so when the frame clock doesn't know that turbo is enabled, we don't know what the counter's ceiling should be. that's why the cat does that when the clock is set to frame clock and turbo is enabled.
