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Sergio Granada-Moreno

Following the discussion in other threads (

https://cycling74.com/articles/time-and-pitch-manipulation-in-max-7/),

 I wonder if anyone in this community can highlight any paper/documentation on the algorithm behind Max 7' [groove~] time/pitch engine. As suggested by @Emmanuel Jourdan, should we assume that this is based on Stephan Bernsee's Dirac algorithm?

http://dirac.dspdimension.com/Dirac3_Technology_Home_Page/Dirac3_Technology.html),

 but this currently leads to Zynaptiq ZTX technology website, which has replaced the forenamed algorithm since Zynaptiq acquired the whole "DSP Dimension" thing; does anybody knows if ZTX and Dirac technologies are equivalent? If such, does anybody can highlight any paper/documentation on this?

As I really want to know a bit more about this amazing new feature any comments would be greatly appreciated. I definitely might missed the obvious so please be nice :)

documentation-on-max-7-groove-pitchtime-engine-dirac-algorithm

Cycling74 could give the definitive answer, you could try writing support, but I'm 100% sure based on all my reading throughout years of following Stephan Bernsee's efforts(he's only one of the greatest DSP-experts on earth today ;D):

DIRAC was in fact Stephan Bernsee's, then he sold his DSPDimension company to Zynaptiq and also joined them to become their CTO.

As a result, Zynaptiq acquired the DIRAC algorithm and all DSPDimension tech, and now DIRAC's been renamed to ZTX by Zynaptiq.

The renaming can even be confirmed in the most recent thread about the latest Max update:

https://cycling74.com/forums/max-7-0-4-released/

(It is also my guess that Cycling74 had to pay extra to include DIRAC within Max7, and there are legal issues surrounding how it is exposed to users, which is why you can't get access to the actual algorithm through the Max7 SDK, and the time-stretching/pitch-detection/shifting/etc. tech of DIRAC/ZTX will NEVER be exposed/accessible to any of the ops in gen~(can't allow for gen~ to generate/expose ZTX-based code). It is a proprietary/licensed algorithm, and Cycling74 will need to keep it protected.)

(^that's the url you are redirected to, if you attempt to visit the old DSPDimension.com)

Hi Raja, and thanks very much for your input. I guess then that [groove~] is now featuring 'Wavelet and multiresolution techniques' as described by Bernsee's in his blog (

http://blogs.zynaptiq.com/bernsee/time-pitch-overview/).

Documentation on Max 7' [groove~] pitch/time engine (Dirac algorithm)