Modular Diary – 080

A little side note on octaves. I noticed at the end of Hordijk’s Rungler Demo at Modular Meets Leeds (at around 14min) that he actually has the Rungler (stepped) out set to cover a range of 9 octaves. I also noticed in a post of his on the electro-music forum that the Benjolin oscillators cover a range of 18 octaves! And that led to a discussion with stschoen on the Audulus forum, who explained the reasoning behind setting the oscillators in his Audulus Rungler to cover a range of 14 octaves:

As far as the oscillator range is concerned, I realized this morning that when I mentioned 14 octaves for my copy, I had taken 2Hz as the lower bound. The real bottom limit for the oscillators is 0.001 Hz, so the actual range is approximately 25 octaves, although I’m not sure that this has much meaning when applied to something running at sub-audio rates. I choose 2^14 as the upper limit for the oscillators since that’s slightly above 16K and that seemed high enough. 2^15 would have been 32K which is well above the Nyquist limit and so couldn’t be produced in any case at a 44.1k sample rate.

There was also further discussion on whether the rungler output should be set as a bipolar audio signal or a (standard) unipolar control signal, with STS eventually deciding to leave it as the latter since it could easily be adapted to an audio out by means of a simple expression, should the need arise.

I did notice in the Mallorca Rungler video though that it seems that the pulse output is also scaled to 9 octaves (in the video attenuated to about 4) and set about trying that out on the STS’ Audulus Rungler. It seems to help with creating a more ‘noisy’ noise when rungling at audio rates.

Modular Diary – 080: A little side note on octaves. I noticed at the end of Hordijk’s Rungler Demo at Modular Meet…

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Rudiger Meyer is a composer interested in the play between traditional concert music and new media.

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