Use capture~ and / or snapshot~. Capture~ is great because it can get every sample, but is not as readily usable (need to manipulate the resulting text file, can’t easily store into a coll or whatever). snapshot~ gives more possibilities for viewing and storing the data but the highest sample rate is once per 20 ms (only good for rough stuff).
You could also record~ the signal into a buffer, then view it as needed. The individual sample contents of the buffer~ could be seen using index~ or some other means.