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    Plugin to generate Frequency, sine sound wave, Win, Isadora 3

    How To... ?
    oscillator sinewave tone generator audio sound frequency
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    • A
      ari last edited by Woland

      Re: [Generative music using Isadora](/topic/4781/generative-music-using-isadora)

      Re: [Generating a Sine Sound Wave](/topic/2205/generating-a-sine-sound-wave)

      Hi,

      I stumble over these older discussions above on generating sound, but couldn't find the (perfect) solution there.

      I wish to make an installation in which a 25Hz frequency gets manipulated by movement and I would love to not have to 'out-source' the frequency generator. I of course have the option to send i.e OSC to another program (such as Abelton Live), but I feel for such a rather small task of sound generation I would like to not involve an extra program. I am thus looking for a Isadora intern solution.

      In one of the older threads I found the option to just play a recorded frequency sound file and manipulate this frequency via the replay speed, this is an option, but I still would enjoy being able to define the frequency in Isadora and maybe also to know to which frequency I manipulate the sound signal.

      I couldn't find any Audio Plugins for Windows (and Isadora 3) that generate a tone. So I am wondering either if somebody knows a audio Plugin that could help me with this task or has another suggestion?

      (I know there have been discussion for version 3 that a tone generator would be release, but I don't think there is one yet... at least I didn't found one....?)

      Thanks in advance!

      Woland 1 Reply Last reply Reply Quote 0
      • Woland
        Woland Tech Staff @ari last edited by Woland

        @ari said:

        I found the option to just play a recorded frequency sound file and manipulate this frequency via the replay speed

         This is still your best option if you want to stay Isadora-native. There is not a tone-generator plugin.


        Here's a reddit post that gives a formula for calculating the pitch change based on the speed change

        s = 2^(t/12)
        Where t is the number of semitones you want to transpose. And s is the playbackspeed you need to play the clip at to get the desired pitch.
        The other answers suggesting to look for a lineair pattern won't get you anywhere close.
        A simple example is playing a clip at 200% will transpose it 1 octave up but playing it at 300% will be 1.5 octaves up. You'll have to play it back at 400% to get 2 octaves higher than the original


        A second person wrote:

        2^(x/12) (*100 for %) where x is the number of semitones. X is either positive if you're going up in pitch or negative if you're going down. This is for equal temperament, not just temperament.

        A third person wrote:

        Conversely, if I play the clip back at 137% speed, how much does the pitch go up?
        change in semitones = −12log2(t1/t2) where t1 = tempo before change and t2 = tempo after change

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        • A
          ari @Woland last edited by

          @woland Thank you very much for the fast reply!

          I am trying to wrap my head around the formula and how to apply it. I though can't yet see how the frequency in Hertz is changing (as I am not thinking in semitones).... not sure if I am just overlooking sth.

          Basically as an example I would like to know if I play 25 Hertz in 200% speed, how many Hertz do i get ....?

          Woland 1 Reply Last reply Reply Quote 0
          • Woland
            Woland Tech Staff @ari last edited by Woland

            @ari said:

            can't yet see how the frequency in Hertz is changing (as I am not thinking in semitones)

            This may be helpful 

            Convert Hz to Semitones

            Chart of Musical Notes as frequencies 1

            Chart of Musical Notes as frequencies 2 (It has a helpful note at the bottom: "To get the semitone frequency, multiply the note below it by 12√2 or 1.0595.")

            I am not a musician or a mathemetician but my Google-fu is strong.

            TroikaTronix Technical Support
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            | Isadora 2.6.1 + 3 | Mac Pro (Late 2013), macOS 10.14.6, 3.5GHz 6-core, 1TB SSD, 64GB RAM, Dual AMD FirePro D700s | Macbook Pro (Retina, 15", Mid 2015), macOS 10.11.4, 2.8GHz Intel Core i7, 16GB RAM, Intel Iris Pro 1536 MB |

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            • Woland
              Woland Tech Staff last edited by

              Also, if memory serves, the incredibly brilliant @Maximortal made an Isadora-based Theremin or synth a few years ago. Maybe Maxi can help out with some insight.

              Best wishes,

              Woland

              TroikaTronix Technical Support
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              | Isadora 2.6.1 + 3 | Mac Pro (Late 2013), macOS 10.14.6, 3.5GHz 6-core, 1TB SSD, 64GB RAM, Dual AMD FirePro D700s | Macbook Pro (Retina, 15", Mid 2015), macOS 10.11.4, 2.8GHz Intel Core i7, 16GB RAM, Intel Iris Pro 1536 MB |

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              • jfg
                jfg last edited by

                https://www.meldaproduction.co...

                https://www.meldaproduction.co...

                perhaps what you are looking for?

                best

                Jean-François

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