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 Kyma Forum
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 BPM Problem
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| Author | Topic: BPM Problem | |
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sidechain Member |
posted 17 February 2003 15:24
 
I'm having a problem using BPMSampleLoop, BPMTimeStretchLoop, and BPMResynthesisLoop. When a fader is assigned to BPM the fader does not change the BPM as expected. At certain points along the throw of the fader the sample playback jumps to half speed or double speed. I need to have the BPM fader function without these jumps like in SampleAccelerator (when you assign a fader to BPM it functions as expected slowing and speeding with no double time or half time jumps). Could someone please tell me how to achieve this? IP: Logged | |
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SSC Administrator |
posted 17 February 2003 18:09
As you change the BPM, those modules do adjust the internal tempo. However, once you get far enough away from the original tempo, it will jump to half time (or double time) and still match the tempo. You can achieve a straight speed up or slow down without the clever stuff by starting with a Sample module and editing its parameters as follows: 1. Shift-click on the disk icon next to the name of the sample file. This will give you the duration of the loop in seconds. For our example, lets say it was 2 s. 2. Divide the duration by the number of beats in your loop, for example: 2 s / 8 This should be the duration of one beat in seconds. 3. To convert this duration to the natural BPM of the loop, use the message 'bpm' . For example (2 s / 8) bpm Select that whole expression and use ctrl-y to evaluate it. That will tell you the BPM. 4. In the Frequency field of the Sample put the following expression: default * (!BPM / (2 s / 8) bpm removeUnits) That will adjust the natural frequency of the Sample by the ratio of the *desired* !BPM to the natural BPM of your sample. IP: Logged | |
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sm Member |
posted 18 February 2003 04:22
1. Shift-click on the disk icon next to the name of the sample file. This will give you the duration of the loop in seconds. For our example, lets say it was 2 s. is there a way to obtain this information automatically e.g with a script that writes the sample duration into a soundtoglobalcontroler ? - or somwhere else where one could work with that data... IP: Logged | |
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SSC Administrator |
posted 18 February 2003 10:04
Here's something kind of fun: Drag a BPMSampleLoop from Prototypes into a Sound file Then close the Class editor and double click on the retrieved example (in the upper left corner of your Sound file window). Take a look at the Script. It is doing a lot more than you need, but you will see in there how to get at the duration of a samples file and use it in a Script. IP: Logged | |
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sidechain Member |
posted 18 February 2003 16:06
Thanks! Your procedure worked like a charm! IP: Logged | |
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sm Member |
posted 21 February 2003 12:16
i tried to "reverse-engingeer" theBPMTimeStrechLoop by following the edit and then "retrive example..." and then trying to do a "new class from example" (the very example i just retrieved.) the script asks me for a value for ?sample which i cannot provide (use default sound) doesnt work. so how can i get around this to use this script. ??? thanks [This message has been edited by sm (edited 21 February 2003).] IP: Logged | |
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SSC Administrator |
posted 21 February 2003 12:51
It asks for default values for ?vars when you create a new class. For most values you can type a number. For Sample, just type in a string, for example: 'aSampleName' IP: Logged | |
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sm Member |
posted 22 February 2003 04:31
yippie! this is it:-) perfect!!!
quote: IP: Logged | |
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korb Member |
posted 06 March 2003 23:58
i got into the script and can see how it is getting the file duration, but can't figure out how to use it in a different context. im my case, declaring the current variable 'sampleDur' global would be ideal, so it could be used in an expression in some field similar to volume like this: -------------------------- ((1 bpm: (60 / !sampleDur) * !Grid) countTriggersMod: !Grid) / !Grid would it be best to use a script that gets the file duration in a SoundToGlobalController? if so, how would the script change? the relevant part of script extracted from the BPMSampleLoop pertaining to retrieving the sample duration, looks like this: -------------------------- file := SampleFile fromOldFileNamed: ?sample ifCanceled: [self abortForKyma]. -------------------------- korb IP: Logged | |
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SSC Administrator |
posted 08 March 2003 10:25
When you use the Script, you can associate values with "?-variables". For example, you could use ?sampleDuration in the Duration field of a FunctionGenerator. In the Script, you associate the value with the variable using the following syntax: nameOfSound start: 0 s sampleDuration: 2 s. where "nameOfSound" is the name of the Sound you have placed in the Inputs field of the Script Sound. What this tells Kyma is that you want to make a copy of the Sound "nameOfSound" to start at time zero, and have "2 s" used in place of ?sampleDuration. In your example, all you need to do is to add this sort of expression to the end of the script, after the other expressions that actually compute the duration of the sample. IP: Logged | |
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korb Member |
posted 09 March 2003 17:14
can anyone tweak this or have a demo of how the duration could be a variable so it could be used in expressions? thanks, korb IP: Logged | |
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sm Member |
posted 10 March 2003 11:03
when you run the sound youŽll be asked to specify a sample name. do this by with something like 'name of sound' (the quotes are important) note that you have to " removeUnits " from the ?sampleDur. |m IP: Logged |
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