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  • Doug
    Posts: 27
    Joined: Sep 15th, 2007, 06:53
    long long portamentos
    I'm looking for a way to create a sine tone that rises smoothly and evenly an octave over 32 bars. (Ultimately I'll want 24 of these playing at once.) I've been working in ES2 but haven't managed anything satisfactory yet. The sine part is easy but the smooth, even glide is eluding me. Anybody out there have a suggestion?
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  • Rounik Admin
    Posts: 8713
    Joined: Dec 16th, 2006, 08:13
    Re: long long portamentos
    Hi Doug, I'd actually use the default Sine wave in the EXS24... I've created a setting for the EXS24 and uploaded it to the Environment download section: [url]http://tnttutorials.macprovideo.com/fileexchange/environments/[/url] Here is a pic of the EXS24 too for reference: [img]http://img393.imageshack.us/img393/5735/picture13gr4.png[/img] The sine wave rises one octave over 8 bars. Let me know if it works for what you need. Cheers Rounik
    Reply
  • Doug
    Posts: 27
    Joined: Sep 15th, 2007, 06:53
    Re: long long portamentos
    thanks, Rounik, it's close I changed the LFO to LFO 1 because it retriggers with the note and I changed the LFO wave to a rising sawtooth. It does what I need but there's some audible zippering as (I assume) the EXS24 is stepping through the 127 midi levels. I've transferred the same approach to the ES2 and it's pretty satisfactory--no zippering, although there were a couple of pitch wobbles for no reason I could figure. I really liked that you could set the pitch change in cents on the EXS24 (the ES2 reads out some other number). I'm surprised that the ES2 is smooth and the EXS24 zippers. Weird.
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  • Doug
    Posts: 27
    Joined: Sep 15th, 2007, 06:53
    Re: long long portamentos
    Okay, I've found a solution: use the sine sweep in the Test Oscillator. It means I have to do some math, but that won't kill me. Thanks Rounik
    Reply
  • Rounik Admin
    Posts: 8713
    Joined: Dec 16th, 2006, 08:13
    Re: long long portamentos
    Hi Doug, I was going to suggest the test oscillator first, but maths isn't my strong point ;-) I was getting the step feel from the exs24 - will try out the es2 later and compare it sometime. Please feel free to post back your observations / suggestions on how t calculate octaves to hz. Out of interest why are you creating sine waves that rise by an octave...? Is it to do with binaural beats or something similar? Thanks, Rounik
    Reply
  • Doug
    Posts: 27
    Joined: Sep 15th, 2007, 06:53
    Re: long long portamentos
    I'm constructing Shepard tones for the B theme of a piece and I want them to be continuously ascending. http://en.wikipedia.org/wiki/Shepard_Tones The article states that the sine tones must be stacked at the octave but that's not so; they can be stacked at any interval whatever and the illusion that you are rising/falling forever will hold. I'll post a demonstration project in a few moments (will need to learn how). I wound up using the ES2 because the oscillator was a nuisance to use and I'm working with 30 channels in my own project. This sound is going to get all chopped up anyway, so a few burbles won't hurt.
    Reply
  • Cajypiu
    Posts: 400
    Joined: Oct 11th, 2006, 09:48
    Re: long long portamentos
    Kia Ora, when I first read the post I was going to suggest the test oscillator too... but you don't have to use the automated sweep... I take it you have tried automating the frequency? Never heard of Shepard tones so you learn something new every day!
    Reply
  • Rounik Admin
    Posts: 8713
    Joined: Dec 16th, 2006, 08:13
    Re: long long portamentos
    Hi guys, Automating frequency on the test osc, as Yadj suggests, could be a good option, but it's the maths again!! ;-) Shepherd Tones - really interesting. Do post a link to your project or your post your project if you like too, Doug. Here are a couple of links to shepherd tones in the meantime: [url]http://www.youtube.com/watch?v=ugriWSmRxcM&feature=related[/url] [url]http://www.youtube.com/watch?v=DfJa3IC1txI[/url] Oh, and here's link to Doug's Logic Shepherd tone demo: [url]http://tnttutorials.macprovideo.com/fileexchange/environments[/url] Cheers Rounik
    Reply
  • Cajypiu
    Posts: 400
    Joined: Oct 11th, 2006, 09:48
    Re: long long portamentos
    Cool... I get what you mean now after playing with the project you posted. I now know how to make half the tardis' noises! As for the maths... just remember, the frequency is the inverse of time and vice versa. Get that in your head and have a play with this freebie piece of software and you're laughing: http://lost-memories.com/softs/
    Reply
  • Doug
    Posts: 27
    Joined: Sep 15th, 2007, 06:53
    Re: long long portamentos
    neat piece of software; I'll be using it I keep making (and then losing) spreadsheets to calculate all sorts of things like that. I use well temperaments always, so I get to do things like "A is 440, so C is (440^(15/12)) = 523 and E in this temperament is C * 5/4 etc. etc. I'm too old for that stuff anymore but because Logic supports all manner of temperaments, I can just set a temperament and diapson and work in the piano roll with ES2; this is beyond cool actually, a nice little game is to open the ascending sines project, get a loop going, and play with the "Tunings" window
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