BPM to Seconds equation and conversion charts

Use this information to determine loop BPM and verify converted loops are the correct BPM.

Here is the formula for converting BPM to seconds:

Number of seconds in a minute / (Beats per minute / Beats per measure)

= length of 1 measure in seconds. Multiply result by number of measures.

So in summary,
60 / (BPM / 4) = 1measurelength

Rewrite the equation so it’s more calculator friendly:

[ (BPM / 4) * 1/x ] * 60 = 1measurelength

Enter it in a calculator like this:
BPM / 4 =
hit 1/X key =
* 60 = answer

Here is an example:

120 / 4 = 30

1 / 30 = 0.033¯¯

0.033¯¯ * 60 = 2

1 measure at 120 BPM is 2 seconds long.

Here are some more examples:

60 BPM (divided by 4 beats per measure) = 15 measures in 60 seconds (60 secs div by 15 meas) = 1 measure is 4 seconds
120 BPM (divided by 4 beats per measure) = 30 measures in 60 seconds (60 secs div by 30 meas) = 1 measure is 2 seconds
135 BPM = 33.75 measures in 60 sec = 1 measure is 1.777777777 seconds

30 BPM = 7.5 meas in 60 sec = 1 meas is 8 sec
88 BPM = 22 meas in 60 sec = 1 meas is 2.72¯¯ sec
240 BPM = 60 meas in 60 sec = 1 meas is 1 sec

It seems simple enough, but do it for lots of BPMs and different measure lengths and you have yourself a handy reference sheet.

!BPM2seconds4-in4-example

BPM conversion charts in 3/4 and 4/4 time:
!BPM2seconds4.xls  !BPM2seconds4-in3.rtf  !BPM2seconds4-in4.rtf

note: the second column (the unlabeled one) is the quotient of: Beats per minute / Beats per measure. In the example above, it is BPM/4. It’s there to save time if I need a more precise number when recalculating.

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Tutorial: How to smash together a shitload of sounds with just a few clicks

howtobatchlayerusinggoldwave

Here is a nifty tutorial to combine any number of sounds into a single multi-layered sound.

For this task, we will need Goldwave.

Get it here.

Step 1: Set source folder

In Goldwave, go to File -> Batch Processing

On the right, pick “Add Folder”. Pick the folder containing your samples.

batchgoldwave-tutorial1

Step 2: Set your process Edits.

At the top, pick “Process”.

batchgoldwave-tutorial2

2a) On the right, pick “Add Edit”. On the left, pick “Mix”, then on the bottom, pick “Add”.

batchgoldwave-tutorial2a

2b) On the left, pick “Set Marker/Selection”, then under Settings, for start marker position, set “percent” to 0, and for Finish marker position, set “percent” to 100%. Pick “Add”.

batchgoldwave-tutorial2b

2c) On the left, pick “Copy”, then pick “Add”. Now click “Close”.

batchgoldwave-tutorial2c

Now it should look like this:

batchgoldwave-tutorial2final

Step 3: Set destination folder.

At the top, pick “Destination”. Under “Store all files in this folder”, pick the folder icon on the right & pick the destination folder. Make a new one or append a new folder name to the end of your music folder.

batchgoldwave-tutorial3

Step 4: Run, verify, clean up extra files.

On the bottom center, Click “Begin”

(you will get one warning because the first file has nothing to be added to it. It’s not an error; it’s normal.)

Now you are done with Goldwave. Close it out & navigate to your destination folder. Scroll to the bottom & listen to the last file in the folder to verify it’s layered. The entire list of sounds should be a sequence of increasingly layered sounds, with the last one being the thickest/having the most layers. Rename it to whatever you want, move it wherever you want, and delete the folder including all the other files. You don’t need them.

Example sound I made mashing up 21 snare samples. (source: loopsdelacreme piezo snares freebie)

Congratulations! You now have a sound comprised of many layers! I hope you find this useful! 🙂

Edit: Here’s another example. I mashed up 43 farm animal sounds. Enjoy! (source: orangefreesounds)