KVR Audio

michu · Post by **michu** » Sun Dec 25, 2011 10:24 pm

<ValhallaUberMod pluginVersion="1.0.0" presetName="PitchForBats" Mix="0.5" Depth="1" StereoWidth="0.718500018" Delay="0" Feedback="0.507000029" Spread="0.5" Slope="0.5" Skew="0.5" Random="0" TapGain="0.5" Diffusion="0.5" DiffSize="0.0204081628" DiffModRate="0.0490490496" DiffModDepth="0.5" LowCut="0" HighCut="1" SpatialXover="0.497487426" DetuneRate="0.0490490496" DetuneDepth="1" VibratoRate="0.298245609" VibratoDepth="0" OverMod="0.462626249" DriveInGain="0.25" DriveOutGain="0.75" DriveNoiseGain="0.333333343" FeedbackRotate="1" SmoothingTime="0.0990990996" ColorMode="1" DelaySync="0.176470593" type="0.0416666679" DiffEnable="0" Drive="1" DrivePrePost="1" Speed="1"/>

so... let's try another bait, Sean, would you care to share some insights about math for tuning pitchshifting with Overmod depending on mod rate and mod type?

jonahs · Post by **jonahs** » Mon Dec 26, 2011 1:45 am

The "a few hints" on page 11 illuminate what I meant when I said I liked the drive and feedback abilities.

To get more speed options I chained a bunch of übermods and made a meta-control in numerology linking the speed controls, so I can change multiples from half to full speed at once, use different sync settings and so on. Very cool. I hope I can find the time to dedicate a BCR2000 to it.

valhallasound · Post by **valhallasound** » Mon Dec 26, 2011 6:44 pm

jonahs wrote:The "a few hints" on page 11 illuminate what I meant when I said I liked the drive and feedback abilities.

More of that this week on the blog.

To get more speed options I chained a bunch of übermods and made a meta-control in numerology linking the speed controls, so I can change multiples from half to full speed at once, use different sync settings and so on.

Sound files or it didn't happen.

Sean Costello

meloco_go · Post by **meloco_go** » Mon Dec 26, 2011 7:29 pm

Sean, is it possible to set up Mod or Room to create a type of echo, where you'd get some sort of a "pack" of reflections around echo time?
E.g. 100 ms echo, with delay starting to build up from, say, 90, than reach max at 100, than decay to 120-130?

valhallasound · Post by **valhallasound** » Mon Dec 26, 2011 7:38 pm

meloco_go wrote:Sean, is it possible to set up Mod or Room to create a type of echo, where you'd get some sort of a "pack" of reflections around echo time?
E.g. 100 ms echo, with delay starting to build up from, say, 90, than reach max at 100, than decay to 120-130?

ÜberMod is designed to create clusters of reflections, that can be grouped together as tightly (or loosely) as desired. For a repeating echo around 100 msec, with a spread of echos, you would want to set DELAY to 100 msec, and mess with the TAPS Spread parameter to get the desired "pack" spacing.

This is where the TAPS Random knob comes in handy. Lets say that you have 8 reflections (i.e. 8Tap mode) with a few milliseconds of spacing between each tap. If the 8 taps are equally spaced, the result will be a very strong comb filter, with the distinctive pitched timbre imparted on the sound (I was going to say "pitched resonance" but technically speaking a feedforward comb filter doesn't have resonance, just zeros). The TAPS Random knob will randomize the spacing between the taps, which reduces or eliminates the pitched artifact.

Here's an example preset for ÜberMod (you can load this into the demo to try things out):

Code: Select all

<ValhallaUberMod pluginVersion="1.0.0" presetName="8TapClusterDelay" Mix="0.5" Depth="0" StereoWidth="0.5" Delay="0.310699999" Feedback="0.754000008" Spread="0.0839999989" Slope="0.5" Skew="0" Random="1" TapGain="0.5" Diffusion="0.5" DiffSize="0.0204081628" DiffModRate="0.0490490496" DiffModDepth="0.5" LowCut="0" HighCut="1" SpatialXover="0.145728648" DetuneRate="0.0490490496" DetuneDepth="0.5" VibratoRate="0.298245579" VibratoDepth="0" OverMod="0" DriveInGain="0.375" DriveOutGain="0.75" DriveNoiseGain="0.333333343" FeedbackRotate="0.5" SmoothingTime="0.0990990996" ColorMode="0" DelaySync="0.0588235296" type="0.25" DiffEnable="0" Drive="0" DrivePrePost="1" Speed="0"/>

This echo consists of 8 taps closely grouped together, with randomized spacing. Turn the TAPS Random knob down to 0%, and a stongly pitched echo will result.

Sean Costello

meloco_go · Post by **meloco_go** » Mon Dec 26, 2011 8:59 pm

Thanx!!

michu · Post by **michu** » Tue Dec 27, 2011 6:27 am

observation: drive section, even when set to 0 dB in and output gain, acts as a low shelf filter subtly cutting low frequencies. also seems to introduce a few samples of additional, unaccounted for, delay - after several minutes a loop will go out of sync.

valhallasound · Post by **valhallasound** » Tue Dec 27, 2011 6:32 am

michu wrote:observation: drive section, even when set to 0 dB in and output gain, acts as a low shelf filter subtly cutting low frequencies.

Yep. I put a coupling capacitor in there.

also seems to introduce a few samples of additional, unaccounted for, delay - after several minutes a loop will go out of sync.

This is a side effect of the oversampling for the drive section. It will impart a nonlinear phase delay on the signal, so there is no fixed delay that can be compensated for (for that matter, the high cut and low cut filters will add some phase delay, but this is true of all filters).

It makes me happy that you are listening to sound looping in there for several minutes. This would happen to me a lot when I added overdrive to ÜberMod. Back when the plugin was still "ValhallaChorus," it was totally linear. Adding a drive section opened up all sorts of oscillating tape echo domains, and I would find myself listening to a sound for hours at a time, getting lost in how things evolved. This is probably a big part of why this plugin took so long to get out the door.

There is also some additional lowpass filtering in the drive section. It is by no means "flat." Lots of signal coloration going on.

Sean Costello

hibidy · Post by **hibidy** » Tue Dec 27, 2011 7:21 am

That's my favorite thing. Being able to feed the signal through the drive and have it just repeat.

mandolarian · Post by **mandolarian** » Tue Dec 27, 2011 7:53 am

hibidy wrote:That's my favorite thing. Being able to feed the signal through the drive and have it just repeat.

Hypnotic isn't it?

hibidy wrote:Being able to feed the signal through the drive and have it just repeat.

Hypnot..

hibidy wrote: have it just repeat.

Hyp...

hibidy wrote: repeat.

hibidy · Post by **hibidy** » Tue Dec 27, 2011 8:33 am

michu · Post by **michu** » Tue Dec 27, 2011 12:30 pm

valhallasound wrote:
michu wrote:observation: drive section, even when set to 0 dB in and output gain, acts as a low shelf filter subtly cutting low frequencies.
Yep. I put a coupling capacitor in there.

seems one of the huge electrolytic ones. i'd not mind if it was wound down a good couple of µF

also seems to introduce a few samples of additional, unaccounted for, delay - after several minutes a loop will go out of sync.
This is a side effect of the oversampling for the drive section. It will impart a nonlinear phase delay on the signal, so there is no fixed delay that can be compensated for (for that matter, the high cut and low cut filters will add some phase delay, but this is true of all filters).

It makes me happy that you are listening to sound looping in there for several minutes. This would happen to me a lot when I added overdrive to ÜberMod. Back when the plugin was still "ValhallaChorus," it was totally linear. Adding a drive section opened up all sorts of oscillating tape echo domains, and I would find myself listening to a sound for hours at a time, getting lost in how things evolved. This is probably a big part of why this plugin took so long to get out the door.

There is also some additional lowpass filtering in the drive section. It is by no means "flat." Lots of signal coloration going on.

Sean Costello

i see why you did it that way and why linear phase filters or oversampling whole signal path was outta question. i was actually trying it out in a simple looper's role, 2Tap and no modulation, just 2 or 4 bars circling. these two fenomena, especially the capacitor thingie, kinda defeat use of drive section for this task. pity, as i love the effect of each layer pushing and saturating sound more, exactly as heard in Fripp's work.
so far my personal, subjective list would be:
- scaling of synced delay time with DELAY slider. i know, i know... but consider that having tempo sync and unconstrained scaling of delay time available at the same time would actually put you at the head of the pack, as few delays can do it.
- not only 1/2 but 1/4 and 1/8 modes
- some alternative drive mode, that would be sparser in coupling capacitors area.
- some way of changing presets with, say, program changes without flushing buffers on switch. old Ariesverb .4 with Dr.Who switch on is more or less what i have in mind.

now, i don't have illusions about probability of such changes/additions appearing in Ubermod. just wanted to voice them

foosnark · Post by **foosnark** » Wed Dec 28, 2011 12:11 am

Buffers don't flush on switch, do they? Or maybe they do and I'm just thinking of the delay time smoothing thing on the Warp panel.

valhallasound · Post by **valhallasound** » Wed Dec 28, 2011 7:15 pm

michu wrote: so... let's try another bait, Sean, would you care to share some insights about math for tuning pitchshifting with Overmod depending on mod rate and mod type?

Use your ears!

Seriously, the math involved varies on a mode by mode level, and I would only count on the 2Tap and 8Tap modes to get any sort of reliable pitch shifting. The presets that have "pitch shifting" were tuned by ear. I have found that higher levels of FEEDBACK are invaluable for this process, as any slight tuning variations will be multiplied by the feedback process.

Sean Costello

valhallasound · Post by **valhallasound** » Wed Dec 28, 2011 7:16 pm

foosnark wrote:Buffers don't flush on switch, do they? Or maybe they do and I'm just thinking of the delay time smoothing thing on the Warp panel.

The buffers do clear. I am not sure why I put that in there, as it will eat cycles when switching. My guess is that there was a good reason, like "things blow up if I don't clear these buffers" reason.

Sean Costello

ValhallaÜberMod