There are a couple of buttons on the back of the Decco that toggle in and out -- one that is for jitter (narrow versus wide) and I believe the other is some type of filter slope.
In my experience, setting the jitter button on the back to narrow sounds noticeably better (and might explain the "soft" sound you hear). I believe the wide button is to be used only if you have a very high jitter source. I would also experiment with the other button as well to see which sounds better to you.
In my experience, setting the jitter button on the back to narrow sounds noticeably better (and might explain the "soft" sound you hear). I believe the wide button is to be used only if you have a very high jitter source. I would also experiment with the other button as well to see which sounds better to you.