When playing any two octave scale or arpeggio, do you (or should you) double the tonics in between the scales, or just play through them both as one whole line?

Thanks!

Play as one whole line.

When practicing a scale in two or more octaves you will want to play thru or run thru the tonic so that it will be one fluid line. As for arpeggios you should only hit the octave one every other octave, i.e. play the root, 3rd, 5th, 7th, 9th, 11th, 13th and then hit the tonic on the third octave. thses are called heptatonic or 7 note arpeggios and you can cover all of the strings with this one and since I play 5 and 6 string basses I also like doing 9 note arpeggios which will end on the third octave and the third interval of any chord you choose to run thru. Also note that this is just my discipline for warming up or practicing any given scale or arpeggio, but in the real music world, sometimes you want to hit the tonic in every octave or not always play the notes in successive order either. Hope this helps.

When practicing a scale in two or more octaves you will want to play thru or run thru the tonic so that it will be one fluid line. As for arpeggios you should only hit the octave one every other octave, i.e. play the root, 3rd, 5th, 7th, 9th, 11th, 13th and then hit the tonic on the third octave. thses are called heptatonic or 7 note arpeggios and you can cover all of the strings with this one and since I play 5 and 6 string basses I also like doing 9 note arpeggios which will end on the third octave and the third interval of any chord you choose to run thru. Also note that this is just my discipline for warming up or practicing any given scale or arpeggio, but in the real music world, sometimes you want to hit the tonic in every octave or not always play the notes in successive order either. Hope this helps.

+1 Excellent advice.

After you get two-octave scales and arpeggios down both directions, then start working on them from lowest usable note on your bass to highest.

Then for improv practice make up some cycles of chords, pick a low note and a high note as your range, then play the scales or arpeggios going up the range and when the chord changes keep going in the same direction just grab the closest note appreate for the scale or arpeggio. When you get to the highest usable note in the range for the current scale or arpeggio reverse direction and come back down. Cycle through your chords a few times so you go up and down the neck and the point you change chords should be different.

This is a tough exercise do it slow, but the end result is a mastery of the neck.