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I don't think anyone only uses one thing.I use scales and arpeggios to allow me to play melodies.Melody is what matters.
Whats your process in a solo? Do you ever use scales if the chord changes are too fast?
Having thought about it, I'm not even sure if I can describe what I'm thinking about when I'm playing solos. I'm probably thinking about melodies and chord tones. If the chord changes were flying past then I would maybe go into arpeggio mode and try to outline the chords as best I could.
If I want to play a fast run or something then I'm thinking about scales and shapes that I am familiar with.