Can't say I didn't warn ya! Great looking guitar. Gretsch doesn't have any low level guitars as far as I'm concerned, only different levels for all. Enjoy the ones you have.
Try a factory reset. I've had to do this on occasion. Other than that all I can suggest is to post your question on the "Spark Amp Lovers" facebook page. You'll find lots of help. It's a fun little amp for sure.
You already have one. The Spark doesn’t need to be plugged into a computer. Once you have your four presets, use it like a regular amp or just use the default settings and tweak them as you would on any amp. Mine sounds great especially through headphones although I try to limit my headphone use...
Sounds right to me. You can easily reverse the saddles to gain more travel if needed and also some leeway on the posts.I put one on my 5120 with no problem.
Welcome to the fold. Nice guitar you chose. Another "mod" you might try on your next string change is to to bring the strings over the top of the stoptail. I did this on my 5220 and like it. It reduces the break angle (for easier bends) and maybe increases the sustain slightly... and like your...