) is the tiniest bit of a pain in the arse 
ta,
Marco
*Tricky* bpm Question, not for the easily intimidated
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- Hun #3
- 4265 posts since 25 Mar, 2002 from A quaint little village just south of Hamburg, Germany
Simple question really, how do i match a loop to any given tempo when all i have is a sampler with coarse /fine tune (ESXP24 in this case)? There must be some kind of formula to it certainly, (a la "if original is 100 bpm and the song is 130, tune it up by 1 semitone and 28 cents"), or a conversion table, as trying (and erring ) is the tiniest bit of a pain in the arse
ta,
Marco
) is the tiniest bit of a pain in the arse ta,
Marco
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- KVRist
- 453 posts since 16 Sep, 2002 from Malaga (Spain)
For well tempered scale, sampling would go like:
phase_delta=2^(semitones/12);
correspondence:
1.0 -> loop_bpm
sampling ratio -> song_bpm
substituing to get the sampling ratio
the formula woud look like:
We isolate semitone shift:
(Edited for error sorry)
That would result is aprox = 4.54.
That would be +4 semitones and +54 cents to achieve 130 bpm from the 100 bpm sample.
If my maths arent wrong ......
phase_delta=2^(semitones/12);
correspondence:
1.0 -> loop_bpm
sampling ratio -> song_bpm
substituing to get the sampling ratio
the formula woud look like:
Code: Select all
song_bpm (130)
2^(semitones/12) = --------------
loop_bpm (100)
(Edited for error sorry)
Code: Select all
semitone shift = (log(song_bpm/loop_bpm)/log(2))*12That would be +4 semitones and +54 cents to achieve 130 bpm from the 100 bpm sample.
If my maths arent wrong ......
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- KVRist
- 253 posts since 25 May, 2001
Results i got with 'Wizoo's WizCalc'
( http://www.getimo.de/linkpage2/html/tools.php )
The loop rates have a relationship of
1 to 1.3, which is:
130percent of 100 bpm
The original loop (Key C3) must be pitched as follows:
From 261.6255653 Hz to 340.1132349 Hz.
Key Nr.: 65 / Note: F 3 / KeyShift: 5
Deviation: -9.1149965 Hz / Cents: -47
Fine Tuning (-128 to +127): -60
MIDI Tuning (-64 to +63): -30
Pitch-Bend (-64 to +63) using 2 half-note range: -15
----
I just tested the 'LoopMeter', you can find on the same site. It does exactly what you need and gave the result: 4 semitones 54.214 cents
( http://www.getimo.de/linkpage2/html/tools.php )
The loop rates have a relationship of
1 to 1.3, which is:
130percent of 100 bpm
The original loop (Key C3) must be pitched as follows:
From 261.6255653 Hz to 340.1132349 Hz.
Key Nr.: 65 / Note: F 3 / KeyShift: 5
Deviation: -9.1149965 Hz / Cents: -47
Fine Tuning (-128 to +127): -60
MIDI Tuning (-64 to +63): -30
Pitch-Bend (-64 to +63) using 2 half-note range: -15
----
I just tested the 'LoopMeter', you can find on the same site. It does exactly what you need and gave the result: 4 semitones 54.214 cents
Last edited by THK on Mon Nov 22, 2004 6:57 pm, edited 2 times in total.
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- KVRist
- 453 posts since 16 Sep, 2002 from Malaga (Spain)
mmm. strange. I think that wizoo calculator is wrong or you entered wrong data.
The formula I stated above is fine.
The formula I stated above is fine.
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- KVRist
- 253 posts since 25 May, 2001
Key Nr.: 65 / Note: F 3 / KeyShift: 5arguru wrote:mmm. strange. I think that wizoo calculator is wrong or you entered wrong data.
The formula I stated above is fine.
Deviation: -9.1149965 Hz / Cents: -47
Well 5 Semitones -47 Cents is pretty similar to 4 semitones plus 54 cents.
Last edited by THK on Mon Nov 22, 2004 7:01 pm, edited 1 time in total.
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- KVRian
- 1121 posts since 4 Jun, 2003 from Skanky Manc
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- KVRist
- 453 posts since 16 Sep, 2002 from Malaga (Spain)
LOL THQWell 5 Semitones -47 Cents is pretty similar to 4 semitones plus 54 cents.
My apologizes, I was looking to something else that just confused me!
This is what happens when one just should sleep more and use the computer less. now i stfu. =
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- KVRAF
- 13444 posts since 14 Nov, 2000 from Hannover / Germany
Don't be such a cheap ass, Bonte! Get some proper loop slicer or a proper stretching app and f*ck all those calculations - in the end you don't want pitched loops, do you?
Btw, that WizooCalc is a handy app. You should get it, Bonte!
Oh shit... I thought it was multi platform. Well, that's what you get from using the superior OS me thinks.
Btw, that WizooCalc is a handy app. You should get it, Bonte!
Oh shit... I thought it was multi platform. Well, that's what you get from using the superior OS me thinks.
There are 3 kinds of people:
Those who can do maths and those who can't.
Those who can do maths and those who can't.
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- KVRAF
- 2058 posts since 23 Sep, 2004 from Canada
Sascha Franck wrote:Don't be such a cheap ass, Bonte! Get some proper loop slicer or a proper stretching app and f*ck all those calculations - in the end you don't want pitched loops, do you?
That all depends on if he is into oldskool breakbeat ,jungle and rave styles really doesn't it
Links to other media sites and contact details are available at the bottom of my artists website.
http://venndiagram.ca
http://venndiagram.ca
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- Hun #3
- Topic Starter
- 4265 posts since 25 Mar, 2002 from A quaint little village just south of Hamburg, Germany
Sascha Franck wrote:Don't be such a cheap ass, Bonte!
bang on SF!! btw Fax, I DO love pitched loops, yeah!
Rozzer, that site is a godsend, thanks! I saved it to my Logic Folder.
Thanks for all the replies,
Marco
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- KVRian
- 1121 posts since 4 Jun, 2003 from Skanky Manc
No probs Bonte
I agree, pitched loops definately have a place. Timestretching can really degrade a loop, plus many dance styles were built on pitched loops, as FaX says.
I agree, pitched loops definately have a place. Timestretching can really degrade a loop, plus many dance styles were built on pitched loops, as FaX says.