Cycling 74 » Topic: Change playback rate to sync different .wav loaded in the same buffer http://cycling74.com/forums/topic/change-playback-rate-to-sync-different-wav-loaded-in-the-same-buffer/feed Wed, 19 Jun 2013 09:59:25 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/change-playback-rate-to-sync-different-wav-loaded-in-the-same-buffer/#post-63916 <![CDATA[Change playback rate to sync different .wav loaded in the same buffer]]> http://cycling74.com/forums/topic/change-playback-rate-to-sync-different-wav-loaded-in-the-same-buffer/#post-63916 Thu, 09 Aug 2012 14:22:17 +0000 alfonso santimone Hi guys,
i’m workin’ on a live sampler/looper.
Everytihing is goin’ fine.
It is conceived as a M4L device.
Some features.
- drop a file on the waveform~ object and the live.drop object extract all the .wav files in the dropped file parents folder.
- once dropped the first file of the folder is loaded into a buffer.
- use an unmenu or a live.dial to select different samples.
- set start and end points for the loop using a pair of live.sliders.
- play the samples at a different rate forward and reverse.
- normalize non destgructively the buffer content.

Now i’d like to add a feature to automatically adjust the new selected sample rate to sync it to the previous sample.
So to speak
S (n) = newly selected sample loop duration in ms
S (n-1) = previous sample loop duration in ms
R (n) = new rate to sync S(n) to S(n-1)
R (n-1) = previous sample rate.

the formula would be

R(n) = S(n) / S(n-1) * R(n-1)

well i’m struggling with this forumula to get the right calculations done.
I guess is still my poor control of the Max event flow.

this is the sampler/looper patch ( i load this as a subpatch in M4L device to have it as a floating window )

– Pasted Max Patch, click to expand. –

this is my poor and fail try to implement the formula about finding R(n)

– Pasted Max Patch, click to expand. –

any help would be greatly appreciated.
even a ” hey you idiot this is the right solution and it is so simple that…well ” , would be greatly appreciated !

…all the patch are commented for me to keep track of what i’m doin’ and possibly for the kind guys that will take a look at it to help.

many thanks in advance and all the best

a.

]]> http://cycling74.com/forums/topic/change-playback-rate-to-sync-different-wav-loaded-in-the-same-buffer/#post-230491 <![CDATA[Re: Change playback rate to sync different .wav loaded in the same buffer]]> http://cycling74.com/forums/topic/change-playback-rate-to-sync-different-wav-loaded-in-the-same-buffer/#post-230491 Thu, 09 Aug 2012 14:23:43 +0000 alfonso santimone

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