Encode data as audio

Hallo I am trying to serialize and encode data into an audio signal so that I can add data into a vídeo file, the idea is to be able to read back the video and have synchronized data. Theoretically I could save a value in the gain of any given frequency, but somehow I cannot get the data to flow from data to AudioSignal then back to value data again in a linear way, in the attached example I am using an Oscillator but I d nned to use a dc style audio level (?) line V2A but for a given frequency.
datafreq.vl (8.5 KB)

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maybe I am wrong, but firstly, I suppose that you need Regions to do so and secondly, did you try to write the data directly in a wav file (presuming that you have all your data collected in advance).