Creating tempo changes can add a significant amount of emotional impact to a piece of music, and you can create these changes with the Tempo Track. MIDI will follow tempo variations, as will Audio Tracks in Timestretch mode and also, Acidized WAV clips. To open the Tempo Track, click the Clock icon in the Track Column.
It’s important to remember that tempo changes remain in effect until any subsequent tempo changes, and the Transport tempo indicator always reflects the current tempo. Note that unlike other programs where the timeline doesn’t change, a very useful Studio One feature is that the timeline reflects tempo changes. For example if you change two measures to half the original tempo, those two measures will last twice as long graphically as the other measures in the timeline. This also means that if you draw a linear series of tempo changes (see below), they will appear to have a curve but the changes themselves are still linear—it’s just that the timeline display reflects whether the tempo is speeding up or slowing down. That’s pretty cool.
I was hoping you’d ask…
I mainly use three types of tempo changes, because each has their use.
Short changes. These happen over a short range, like slowing down the tempo slightly during the measure before going into the big chorus, or speeding up a little during a couple measures before a solo comes to an end.
Long-range changes. Here’s a good example of why tempo changes can be really handy. For a particular set, there was a song at 127 bpm followed by one at 133.33 bpm (locked groove tempo). I started a linear tempo change about 2/3 of the way through the first song, slowly increasing the tempo to 133.33. It took long enough that you didn’t really notice the tempo was changing, but it added a feeling of anticipation and segued perfectly into the second song.
It’s easy to create a linear series of tempo changes. Choose the tempo change resolution with the Quantize parameter (it doesn’t matter if Snap to grid is on or off). Hold [Option/Mac] or [Alt/Windows], click, and draw the line. While still holding down the modifier key, you can drag up or down to change the final tempo. Holding the shift key gives 0.1 BPM resolution. For finer resolution, place the cursor in the section containing the tempo change, and enter the number in the Tempo Track field. (Note that the screen shot doesn’t show the fine resolution of the tempo changes, but they’re there.)
“Time Traps.” Suppose you want to add a short, almost subliminal “dramatic pause” at some point, like just before some booming snare drum hit signals the start of the chorus. Although you could shift your tracks over a bit or insert some space, it’s much easier just to do a radical tempo drop (e.g., from 120 to 50 bpm) for a fraction of a beat where you want the dramatic pause. This sloooooows everything down enough to add the pause. (Ideally, you’d want something that sustains over the pause—silence, a pad, held note, etc. but that’s commonly what will be happening anyway.)
Studio One has a neat trick for doing these: you can edit non-consecutive tempo changes simultaneously. This is important because the amount of tempo change is pretty crucial to get the desired effect, so if you want to add more than one time trap in a song, adjusting one can adjust them all. Simply use the Arrow tool to click and drag over the tempo change you want to edit, then hold down Shift and use the Arrow tool to click and drag over any additional tempo changes you want to edit. Editing one edits them all.
Modifying the tempo track can allow a song to “breathe,” like what happens when musicians play together. If you haven’t experimented with subtle (or even dramatic) tempo changes, you’re in for a treat when you do.