Hello Lennert,

There are two ways your question might be interpreted, as illustrated by two examples.

In the first example there is a group of eight 64th notes, each separated by a 64th rests. They occupy a total of 16 x 64th = one quarter note span. If you want to remove the 64th rests, and change each pair of 64th note and 64th rest to a 32nd note, just select all of the notes, and click the 32nd note button to change them to 32nd notes.

However, I suspect you might be asking for something different.

In the second example, there is a group of eight continuous 64th notes, without separating rests. They occupy a total of 8 x 64th = one eight note span. In this example, you want to change the 64th notes to 32nd notes, thus doubling their total span from an eighth note to a quarter note. Is that what you want to do? If so, there is currently no convenient way to do that in Composer.

Cheers
-- Mark