Non-visual foci for tulpas and aphantasiac hosts

[I'mBadAtNames]

After months of trying to see my tupper (along with literally anything else) in my mind, I think I can confirm that I am an aphantasiac, and in a previous question that I asked regarding this, I was advised to "use a non-visual focus". However, I am not sure of what this actually means, and I can't look for sutiable resources due to a lack of those on here, so I will ask:

 

What does it mean to use non-visual foci to see my tupper? Please give examples if possible. If possible, try to link the examples to my situation, as stated below.

 

Additional information: We have not developed any sort of coherent mind voice for the tup; however, tulpish is up (but highly unreliable due to parrotnoia), and is our primary communication method that conveys more than one binary digit of information. Her scent only appears rarely, but is clear when it does appear. She also can do presence imposition and some tactile imposition (but only when she touches me; the inverse results in hand directly going through), assuming that my observations are accurate and they are not the results of my puppeting. On a slightly related note, my tupper may be more spontaneous than I am, again assuming that I am not parroting and/or was not actually playing the word association game with myself.

 

Any responses to this will be most appreciated.