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Old 2010-10-17, 01:10
Kronsteen
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Sub-Audio Downloads - for Extra LFOs and Extra Slow Modulation

Sometimes you need an extra LFO in Thor. And sometimes you need an extra-long, extra-slow LFO. Even one with a period measured in minutes, not seconds. An LFslOw. A sLowFO.

With Thor's ability to use audio as a modulator, you can make your own LFOs - audio waves with frequencies much lower than the audible range, loaded probably into an NN19, looped, triggered and fed into one of Thor's four audio-in sockets.

So, here is Kronsteen's LFSlow collection. 466 slow waveforms, including the standard sine, saw, triangle and ramps, plus inverse and power-raised sines, harmonic variations of all these, plus 50 random waves.

Download:
Part 1
Part 2
Part 3
Part 4

Total download size: 10.6MB

Each wave has a period of one minute, or a frequency of 0.0166 Hz - about as slow as Thor's LFOs can go. But by pitching down in NN19, their cycles can go to song length if you want. Of course they can be pitched up for higher speeds too, to be used as more conventional LFOs.

LFOs don't need the same bitdepth and resolution as audio. These are 8-bit, giving 256 levels to map onto Reason/Record's 128. They have a sampling rate of 256Hz - so even if you pitch down four octaves, you still get 16 levels per second, which should be enough.

Which means each minute-long sample is...16KB. So it shouldn't overburden your CPU too much.

These are the wave types:
- UpSaw
- DownSaw
- Sine
- Inverse Sine
- Sine raised to powers (^2, ^4, ^8, ^16)
- Sine raised to fractional powers (^1/2, ^1,4, ^1/8, ^1/16)
- Triangle
- Ramps at 12.5%, 25% and 37.5%
- Random (white noise at 1Hz, interpolated)

All waves except the random come in 16 variants - one with just the fundamental frequency, plus 15 with all permutations of presence or absence of the next four harmonic partials.

Rather than try to describe all of these, each WAV has a corresponding GIF, showing the waveform. Browse through the GIFs, and you'll see what the waves look like, and which ones might be useful to you.

Unfortunately there is of course no simple way to tempo-sync these waves, but if you want extremely slow evolving pads, or subtle analog-like pitch drift, or just an extra LFO occasionally, they should be useful to keep around.

Thanks to James Bernard for inspiring this little project.
 

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