for most players, raking will by default feel like the more natural movement, due to the fact that the 'pulling' motion is conducive to moving across the strings in a descending fashion towards your body. however, i am a huge proponent of diligently practicing strict alternation in the practice shed in order to improve the level of your plucking hand's technique. alternation is important because it evenly splits up your right hand workload amongst your picking fingers, thereby making your picking more efficient and promoting economy of motion. Regardless of whether you use two, three, four (or more!) picking fingers, alternation is a key concept that will help you to be more proficient. you might not see the immediate benefits of alternating for grooves or phrases you might already be comfortable with; however, if you push yourself to play outside of your comfort zone on a regular basis, you will quickly notice the technical advantages of being able to alternate at a consistent and predictable level... for example, if you are playing phrases which have you skipping strings in a descending direction across the strings, you will be able to avoid the little 'stutter steps' that would normally occur if you were raking through that same phrase at a fast tempo. my personal philosophy for alternating, which i implemented into my practicing for many years until the point of it being completely subconscious, is to make it and the raking technique equally as easy for me when playing the bass. in other words, your goal should be to be equally proficient at both, so that in real world musical scenarios on stage, your body will be able to spontaneously select the most appropriate method for executing your phrase. alternating is not 'better' than raking; neither is raking 'better' than alternating. they are 2 different technical disciplines that you should master in my humble opinion. also, don't forget to practice using different lead fingers for each exercise... in other words, be able to lead with finger 1, 2, (or 3?) with the same level of comfort and skill. hope that helps!
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