If you know the BPM of a drum loop sample and you want to pitch that loop up or down to make it play at the BPM rate of your song in Reaper, I have created an Excel file that works it out instantly.
Download the Excel calc here:
https://www.dropbox.com/s/944fbajlsk...0Calc.zip?dl=1
The above zip file contains both
.xls and
.xlsx files of the calculator. You cannot open .xlsx files with Excel older than the 2010 version, so I have included both, but the two files do the exact same thing.
The cell with the formula is protected, but you can easily just unprotect the spreadsheet to see what's in the cells, there is no password protection on the spreadsheet.
The calc uses a natural logarithm formula (yawn!) in the far right cell:
=LN(B1/A1)/0.05776227
Now if you type say "138" in the left cell and "140" in the next cell along, the far right cell will tell you the semitone increase or decrease needed, which you can then just enter into the box in Reaper's sampler that says "Pitch offset".
It all matches with this:
http://www.thewhippinpost.co.uk/tool...calculator.htm
What if that website goes down? What if you're offline?
As long as you've got Excel, that's all you need.
This is such a revelation for me personally, it means now I don't need to physically edit
any loops
ever again, or mess about working anything out. Just type the two BPM values in and I have the answer instantly.
Prior to this, I was altering the pitch of the sample file after putting the BPM in another calc I have got, it was a far slower way of doing it because I was having to physically change the WAV files in another audio editing program.
Now... imagine if this feature was part of Reaper HINT HINT.