Rythm Game - Move objects synchronized with the music

Hi everyone,

I try to do my first mini-rythm game. Currently i use DSP time to make objects move to a position synchronized with the music like Deemo, Guitar Hero, etc...

My problem is that dsp time not refresh often enough so my objects don't have a constant speed (i use Lerp(instantiatePosition, wantedPosition, percentUntilNextBeat) so when last frame have the same dsp time object don't move). I can't use Time for move them for synchro so how can i solve my problem ?

Thanks you and sorry for my bad english.