Tremelo

You master the tremelo the same way you master any musical pattern.

By LOOPING the pattern so you can play many repetitions in a short time.
By playing the loop as musically as you can - with rhythm, articulation, dynamics and attention to timbre.
By choosing different starting points in the loop.

The standard right hand tremolo pattern p - a- m - i is a variant of our basic STROKING pattern a - m - i - p.

Let's practice the standard right hand tremolo pattern.

Abstract the pattern and apply it to different material (In this case a C major scale in first position)
Make a pedal tone of the upper tonic
Choose different starting points in the loop

Steady and with the marked accents:

Then begin on i changing the pattern from p a m i to i p a m.

Exactly the same notes but played in a different order:

Then begin on m changing the pattern from i p a m to m i p a.

Maintain the regular accent pattern to make sure you are not just running the notes in an indistinct loop.

Then begin on a changing the pattern from m i p a to a m i p.

Needless to say all this should sound like a piece of music. Perhaps an excerpt from a toccata?

Benefits:

You have learned a musical technique from various angles
Created a useful musical device which you can use as an introduction" an interlude a joining passage or in a composition.