There’s no requirement to tap your foot and you’re probably better off if you can internalize the tempo without tapping anything. If you need an aid to internalize the rhythm, you can move any part of your body that works for you. If you can’t do it with the bass, start by using your hands on your lap to get a sense of the rhythm before you start playing the piece. vocalize the rhythms by counting them out. Also practice playing with a metronome or backing track if you don’t already.
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