I don't think they need to be that subtle. They are literally telling people if they don't get jabbed they are a danger to themselves and their loved ones. They are especially pushing the get vaxxed for others messaging
It's not subtle it's making them believe it and not believe anyone that says otherwise. It's putting fear of covid in their mind like the boogyman when we were kids. It's bypassing the superego by not including the rational mind when they make decisions on covid. It's just "I MUST HAVE IT BEFORE I DIE FOR SURE NO WAY I CAN SURVIVE WITHOUT IT. If I had audio equipment and trained I'm sure I could isolate sounds on higher hz and then separate and amplify them at a lower range and then hear them if they are there to be heard. It would be like an oscillarscope and just see, hey there is a regular signal at the 22khz range when it's just a man talking that would be in the 1-4khz range normally, isolate and make it so it's in the normal voice range adjusting tone also. It might seem like a ringing in your ear at the higher range but so low it's almost like tenitis but you don't have tenitis which is fucked up.
The problem with sub audible sounds is that they wont get past degraded hearing. We lose access to frequencies through mechanical degradation and so wouldn't penetrate to the subconscious aurally. There are other tricks they are likely to use. For example TV watching puts you in a suggestible state. There are also audio frequencies that don't need to penetrate aurally, for example the US military have experimented with sound in crowd dispersal technique using frequencies that literally hit you in the gut causing extreme discomfort. There are also other techniques to control mood and feeling with music. It is likely the MSM propagandists are using this, so ominous tones to make the viewer wary of something or soothing tones to convince through engendered good feeling.
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