We recently released the sound effect of tremolo and drum rolls within the editor.
The effect sounds very different depending on if the instruments is from the strings, keyboards, woodwind, plucked strings or of course from the drums family.
Here is an example of the tremolo in action with strings:
That's only a first version which will keep being improved over time, so please let me know if you have any suggestions about it!
I hope you will really enjoy it!