Step 3: Checking the BPM (Beats Per Minute)

Before any of your Ots files can be automatically beat mixed in OtsAV, the following areas need to be checked, to ensure a perfect beat mix occurs.

Open an Ots file, and click on the Beat Info chunk for an Item. Click on the Edit... button to open the Edit Beat Info window.


1. Check the BPM

In order to align beats when beat mixing, both songs must be played at exactly the same BPM (Beats Per Minute). Ots Studio can Auto Detect the BPM of most songs accurately, up to four and a half decimal places (e.g. 130.89209). It is because of this level of accuracy that Automated Beat Mixing in OtsAV sounds so clean and tight.

The Auto-Detect BPM feature does an excellent job at determining the BPM of the Intro and Outro sections of your music.

Click on the   button.

Note: If you have used the Batch Auto-Detect BPM Tool in Ots Studio, the BPM values have already been calculated.


In some cases, the Auto Detect BPM feature may not be able to calculate the BPM correctly. It's possible to override the Auto BPM settings, and correct any BPM miscalculations.

To check the calculated BPM, click on the Audible Beat Marker Loop checkbox. A metronome will now play at the same speed as the calculated BPM for the range being setup. The metronome will play a 4 beat loop, with the 1st beat sounding different to the other three. This emulates the beat counting of 1..2..3..4.

Note: The metronome can also be started by holding the CTRL key on your keyboard, and double-clicking in the Upper Waveform display.

The 1st metronome click should be aligned with all 1 beats within your song. If these are not aligned, you may need to alter the position of your Match Point marker.

To stop the metronome, un-check the Audible Beat Marker Loop checkbox, or simply click once in the Upper Waveform display.

If the clicking from the metronome isn't in time with the song, you may need to adjust the BPM value manually.


Manually calculating the BPM

To manually calculate the BPM of a Range, follow the steps below.


1. Locate a section of the Range that contains clearly definable beats. You can navigate through the song using the Seek Bar in the Lower Waveform display, or use the Zoom buttons to display a larger portion of the song in the Upper Wave display.


2. Click at the beginning of a defined beat while holding the Shift key on your keyboard. The Upper Waveform display will zoom in on the selected beat. Repeat this process to zoom even closer.


3. Place your mouse cursor at the very beginning of the beat, and right-click your mouse. A Green line will appear. This is known as the Beat Anchor marker.


4. Zoom out, using the Zoom buttons , enough so that you can see at least 4 more beats.


5. Count 5 beats to the right of the Beat Anchor marker, and identify the beat. Hold the CTRL key and drag the purple Beat marker in line with the start of the 5th beat (or the first 1 beat after the Beat Anchor marker).


6. The BPM will be very close to being correct, however you can get the BPM perfect, by zooming in and setting the Beat marker accurately. Place your mouse cursor at the beginning of the 5th beat, hold the Shift key and click until you are fully zoomed in.


7. You can see from the image above that the Beat marker is not exactly at the beginning of the beat. Hold the CTRL key and drag the Beat marker to the beginning of the beat.


Tip: To get even better BPM accuracy, move 16 beats or more into the song, and align the Beat marker as described in Step 7.

8. Click on the Audible Beat Marker Loop again, to check that the adjusted BPM value is correct.


The actions above should be applied to Intro and Outro Ranges as necessary.



Proceed to Step 4: Setting the Match Point markers