Just going to say I don't have any experience with music/music theory so the way that I may not be right in the way that I describe my problem though I think it will be easy to understand.
Right now I play D4 A3 F4 D4 - B3 G3 D4 G3 - A3 B3 A3 D4 - A3 B3 A3 A3 in a loop, on a vibraphone with elements to back it up etc.; where each note is played at one-fourth of a second. I am now 1 minute 30 seconds into the song and I want to change the progression up, or maybe play at one-eighth of a second. The response I may receive will also help my understanding of a similar problem in the future, I hope.
Thanks in advance, and if you have any questions, eg. my describing, I will be pleased to answer.
EDIT : Sorry that I confused you, I play at 120 bpm each of the notes is on the beat.