Rene - Question on Rapture Cutoff Mod Behavior

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Cygnus
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2006/07/02 14:28:25 (permalink)

Rene - Question on Rapture Cutoff Mod Behavior

Hello Rene,

Steve Cox at Technical Support suggested I drop you a note via the forum on a question concerning behavior of the modulated cutoff frequencies for Filter 1 and Filter 2. Maybe I'm out to lunch or maybe its already been flagged - either way, I'd be happy to carry this off-forum, direct via e-mail if preferred.

And may I say that I find Rapture an inspired instrument with a vast open-endedness that borders on overwhelming. Well done sir. And consider that this is only Rev 1.0 of what will surely be a long life of updates and enhancements.

Cyg
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    René
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/02 14:53:26 (permalink)
    Hello, thanks for your kind words. What would that question be?


    -René
    #2
    Cygnus
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 09:45:48 (permalink)
    Most Welcome Rene -
    And please caveat this with possible "operator error".
    There appears to be a difference in how the cutoff behaves for Filter 1 versus Filter 2 using the STEP control (didn't check for other mod sources). For identical cases of base filter frequency setting ( 4013 Hz), step amplitude (100%) and depth (1200 cents) the modulated cutoff frequencies did not look to be the same with each filter operating independently. Filter 2 cuts off at around 8000 Hz. Filter 1 cuts off at around 6000 Hz. I've attached a plot of the joint frequency response curves for Filter 1 and 2 with the parameters noted. Other questions about the particulars, please let me know. The input waveform was "900-Noise" and all other signal path options were set to Off.

    If this is reproducable and not something peculiar to my setup, might be worth a look.


    Thanks,
    Cyg

    #3
    René
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 10:49:00 (permalink)
    Thanks for the report. I can confirm this issue: the Step Generator for Filter 1 Cutoff is affecting Filter 1 with a depth of 6000 cents instead of 12000 as the UpDown selector indicates, and as Filter 2 is. Therefore your measured cutoff difference.

    I have already implemented a fix for it, which will be reflected in the next update to Rapture. In the meantime, here's a workaround:


    1- Download this file, containing two .sfz files:

    http://www.rgcstuff.com/Rapture/misc/Filter1_StepGen_12000_Cents.zip

    2- Extract it in the same folder where Rapture.dll is. You should see 'DefaultEffects.sfz' and 'DefaultRegion.sfz' there.

    That's it. They will override the internal definition for the interface. Note this workaround is valid only for your created patches, factory patches using the stepgen1 to control cutoff1 will need adjustment according to the 'new' range. I'll make that adjustment automatic for next version release.


    -René
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    b rock
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 11:50:26 (permalink)
    I have already implemented a fix for it ... In the meantime, here's a workaround:
    The foresight continues to amaze me. By the time I had a test platform set up, the fix was in place.
    It took me this long to stop shaking my head enough to reply. Download the workaround, everyone; it makes a big difference.
    #5
    René
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 13:50:36 (permalink)
    ... knowing that it might make factory patches sound different, that is



    -René
    #6
    awilki01
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 14:51:33 (permalink)
    Hopefully, I misunderstand. When Rapture is updated in the next patch release, will the programs I created sound different for those in which I used the step generator on cutoff 1?



    My website:
    www.davidadamsmusic.com
    #7
    René
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 16:06:43 (permalink)
    No. All patches using current version will remain sounding the same.




    -René
    #8
    b rock
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 19:25:45 (permalink)
    it might make factory patches sound different, that is
    You mean ... there's presets?

    Nice analysis, Cyg.
    #9
    lawapa
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/03 20:56:41 (permalink)
    You mean ... there's presets?


    Yes indeed. But for some reason I've not quite made my way through them all just yet. They are full of some really great examples.
    #10
    Rick McNab
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/04 06:55:16 (permalink)
    ORIGINAL: b rock

    You mean ... there's presets?



    Remember, one user's presets are another's sweat and tears. In my preset browser are a bunch of really cool sounds by this guy named b rock
    #11
    b rock
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/04 07:15:22 (permalink)
    Remember, one user's presets are another's sweat and tears.
    I'm sure that everyone knows that my comment was tongue-in-cheek. My first stroll through the included presets revealed the multi-oscillator panning trick with zero Detune that I love to use so much. It also pointed me towards using BitRed and Decim; something I would've never sought out on my own.

    Just two examples of learning something from the hard work that others put into the synth in pre-production. I learn something new every day about this design. Case in point: this thread in its original form.
    #12
    Cygnus
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/04 12:43:25 (permalink)
    Happy to help Rene. And appreciate your quick turn workaround.
    Cyg
    #13
    Cygnus
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/04 12:50:21 (permalink)
    Thanks B - Glad to contribute.

    Cyg
    #14
    Rick McNab
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    RE: Rene - Question on Rapture Cutoff Mod Behavior 2006/07/04 21:15:06 (permalink)
    ORIGINAL: b rock

    I'm sure that everyone knows that my comment was tongue-in-cheek.



    Of course, mine too!
    #15
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