I will provide more information later, but quickly, I am playing a Hohner Piano 27. Only effect is delay. Of course I used some EQ (not much) and compression during recording. All modulations you hear originate with technique (and having the right melodica). Mic is just standing in the room, but I play the mic considerably. Much of this is documented in previously posts. Search on “blues” or “blues melodica” or “keyboard harmonica” on this site to find many of my posts on these topics. I have to run. I will post more later. The Guitar Backing Track website is hard to use. Keep trying and you will find a list of blues backing tracks that you can preview.