Some would say everything I play is improvised, even when not intended to be.
The latest CD my collaborator and I compiled was intended to sound mostly like a 3 piece garage band jamming on a lick. We have played together for about 25 years, so we can add structure to a jam with a single word, glance, movement, or other cue, but it usually comes down to a tiny bit new and a lot of same old.
I keep telling my collaborator I only know one lick, and just move it up and down. After 25 years he still thinks I play different and "new" stuff all the time. :-)
Welcome, Novice. I assume you mean the Rockman headphone amplifier? I'm not sure what effect you think it gives, as it's simply an amp that feeds into a pair of headphones. If you want effects, you'll either have to add pedal(s) into the chain, or play with the volume and tone knobs on the guitar. If you can expound a little, perhaps we can be more helpful.