Originally Posted by djfresha
Subtractor. Noise Osc turned on, OSC 2 turned off, set so Osc 1 is not heard. Play note, should get just white noise.
bounce to sample as a white noise clip. On audio track, allow automation of LPF and HPF, so that you can control filter fade in to create a swoosh sound. Also allow automation of fader, to set the level of swoosh on entry
Also you could mix in the reverse cymbal too (layered with white noise)
Personally I would use the noise OSC in thor, then automate a multi-state BP filter within that same instance of thor.