ForumsSoftware ← Sumu - Unable to set Partials Time LFO modulation properly to 0

Dear Randy,
Absolutely loving Sumu/Vutu.

Sometimes I want to make static/motionless sounds as a starting point and set the depth of LFO -> Partial Time to 0 but it still seems to modulate. I can set the LFO rate low and this helps but wonder if it would be possible for LFO depth to actually be 0 when it is set to zero.

I presume this is a platform agnostic thing but OSX10.14 w/ableton 11 with Sumu running as VST3.

Many thanks,
Rob

You can add an LFO to the partial time but most patches including the default don't have that. I wonder what you are hearing that is modulating. When you pull up the default patch do you hear the modulation?

Starting from the default patch:
I set the number of voices to 1.
drift to 0.
I delete the patch cord that is auto advancing partial time.
I swap the default saw wave out from tones/saw to tones/digi-flute
I manually advance partial time to say 0.15

This produces a relatively static sound though there is some slight motion.

If I then increase the amount of LFO modulation to partial time from 0 to 0.21, I of course get obvious motion.

If I then decrease LFO modulation depth back to 0 I can still see the yellow "play head" line moving and hear the slight modulation.

If I then drop the LFO rate to minimum (0.06) the modulation is less noticeable at this slow rate. If I increase the modulation rate to 5 or 6, I can hear the (shallow) tremolo-like effect as the play head moves a tiny amount. This is with modulation depth set to 0.

It seems like a rounding error, where 0 is not actually 0, and is also different to -0 (which is also a valid setting for LFO depth in Sumu)

I'm probably a total edge case not worth too much of your time, but have been trying to make textured but relatively unmodulated sounds to use as source material to expand the palette stored in my old roland rompler, in the style of its factory sounds but with my own flavor.

This produces a relatively static sound though there is some slight motion.

At this point you still have the noise output from the partials module going to the oscillators. So there will be noisy modulation.

If I follow your instructions and I delete that patch cord (from partials / noise), I hear a completely static tone, except for any beating between partials.

To remove the LFO modulation entirely you can double-click the amount dial in the popup to set the default value of 0.

The dials can be at values other than exactly 0 while the numbers read 0.0. You just helped me think of something though, maybe some kind of indicator for when a dial is at its default would be helpful.

I think Sumu will be a good tool for exploring your updated rompler sounds idea, I have had similar thoughts myself. Have fun!

This info was super helpful, thanks Randy!