us-1000 whooshing sound after 5 minutes on neck or temple

has anyone else gotten a whooshing sound for a few minutes after using the us-* for 5 minutes on either the temple or the neck/vagus area? Its a pulsating whooshing sound, not unpleasant, kind of trippy. I'm very new to ultrasound stim so maybe it fades with continued practice. At first I thought it was because I applied the us to the temple, but even after using it on my neck, I got the same effect.

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