A voltage controled sample and Handle coupled with a glide time ?

[honki-bobo]

Send the output of the Glide Module into the CV amount of an Amplifier module, connect either the sine or the triangle of the LFO to the input (and why not both?)
and modulate wath you want, randomly and smoothly with the output of the amplifier !

Two things I'd like to mention here:
Try to avoid using the Formula module. It is extremely CPU intensive, especially for what it does in your patch. Since you're just scaling and offsetting you can easily replace the Formula modules with a combination of Attenuverters and DC Offsets.
And the second Formula module (and subsequently the second Glide module and the Amplifier) can create outputs of +/- 15.15V. This might be what you want, but it caught my attention.

replace_formula.jpg (165.43 KiB) Viewed 16520 times

[utdgrant]

Can I suggest the Smol Rat module? It is available completely free-of-charge in the Dome Music Technologies Freebie Collection. Just using the front panel knobs, you can set rise and fall times to 10 seconds. However, if you use the ACE Constants and Multipliers module (also included in the Freebies Collection) as a CV input to Smol Rat, you can get insanely slow slew rates.

The RAT Pack Bundle and ACE Bundle user guides are available here.

EDIT:

Be aware that the output of Smol Rat will be an exponential RC charge / discharge curve, so it might not be exactly suited to your needs.

However, it is possible to configure the modules of the Audio Computing Engine Collection to generate a strictly linear slew-rate limiter. In fact there is a preset which allows you to vary the curve shapes from logarithmic, thru linear to exponential, in the same fashion as the Make Noise "Maths" hardware module. The rates can be made ultra-slow and voltage-controllable, too. Unfortunately, the ACE Bundle is not free-of-charge, but I think $5 is a fair price for eight active modules. Full disclosure: I'm the developer behind Dome Music Technology products.

[utdgrant]

I used three Smol Rats in series to smooth the output of a random sample & hold signal. Both the LFO frequency and the slew rates of the Smol Rats is controlled by a single control voltage source. This CV source is Channel 1 of the ACE Constants and Multipliers module.

Smol Rat Random Slew Patch.jpg (382.29 KiB) Viewed 16474 times

Smol Rat Random Slew.jpg (64.27 KiB) Viewed 16474 times

Smol Rat Random Slew.voltagepreset

(18.17 KiB) Downloaded 727 times

Video demo on YouTube

[utdgrant]

Using the S&H output of an LFO to determine the SLOPE / Rate of Change of an ACE Integrator module. The higher the output value of the LFO, the steeper the slope of the Integrator output. Positive output from the LFO leads to an upwards slope, while negative LFO outputs leads to downwards slopes. Note that the integrator output does not attempt to 'aim' towards the LFO output. The overall slope rate and the LFO frequency are both voltage controlled by Channel 1 of the ACE Constants and Multipliers module.

Integrator Random Slope LFO.jpg (226.67 KiB) Viewed 16472 times

Integrator Random Slew.voltagepreset

(15.37 KiB) Downloaded 794 times

Demo video at YouTube

[Steve W]

Great discussion!! Even though I will probably never implement this kind of control in terms of glide per se, the approaches presented here are very informative!!

[Jean d'Oran]

yes, very interesting discussion, and which allows us to see that there are many ways to achieve the same result. These exchanges were very informative, allowing me to consider modules whose I did not suspect the existence ... or whose I had not understood how they worked. Anyway, thank you all.
Ultimately, this discussion allowed me to simplify the gas plant that my patch was at the beginning !

[Jean d'Oran]

Hello everybody !
Resumption of the discussion, with another solution because I had not properly posed the problem, nor what I wanted to obtain: a progressive and random variation in voltage with a period of more than 3 minutes, or even 15 minutes.
The easiest way to get this "random LFO" seems to be the use of 3 LFOs with fairly close frequencies and mix them. Each LFO delivers a bipolar sine wave, modulated by the random voltage coming from itself, made unipolar by the addition of a DC voltage of 5 V, and negative by its processing in the attenuverter. At each cycle, the frequency is thus modified. If the Random is -1 V it is divided by 2, and for -3 V divided by 8 (2 to the power of 3)

The DC Source 1 button also globally modulates the speed in the same ratios : with a starting frequency of 0.02 Hz, and -5 Volts applied, it becomes 0.000625 Hz, i.e. a wavelength of 1600 s (26mn 40s)
Button 2 is set to 5 volts and should not be changed. It says 10V because there are 2 cables... This makes the random voltages of each LFO positive, then inverted, so they just slow down the frequency. You can adjust the amount of these slowdowns by moving the fader button. This can further increase the division of F up to 2 to the power of 15 (10+5), or for 0.02 Hz initially, you obtain 0.00000061035156250 Hz or a wavelength of up to 18 days 23h 6mn 40s in theory !
Finally, the amplitudes of each LFO in the mixer are modulated by their own inverted ramdom, to reduce patch accelerations when the value is near 0.

[Mode edit on]
Sorry there were a mistake on the R_Ware Control learnings... it's corrected :
[Mode edit off]
the patch :

LFOs aléatoires vraiment.voltagepreset

Ramdom LFO

(34.06 KiB) Downloaded 528 times

and a musical try with 3 patches (let it breathe)

aléatroie Radiguien complexe.voltagepreset

a drone

(85.97 KiB) Downloaded 617 times

[Jean d'Oran]

Finaly I found a solution a little different :

triple LFO alea Fini.voltagepreset

(39.13 KiB) Downloaded 26 times

Randomizing an LFO
for its frequency :
To begin with, the sine wave of a bipolar LFO. Its own sample & hold is synchronous ; we make it positive monopolar by adding to it +5 V generated by a DC Source i the jack-in of an attenuator. It goes from -5/+5 V to 0/+10 V ; a 50% attenuation results in 0/+5 V, sent to the LFO's FreqCV. With a modulation amount of -100%, the LFO frequency will change at each cycle, being divided by a value between 1 and 32 depending on the value given by the Sample & Hold.

For the amplitude :
The advantage of the simple amplifier from Dome Music Technologies (UtdGrant) is that it accepts both positive and negative voltages as CV inputs, which it transforms into their absolute (positive) values. So, regardless of the modulation polarity, the signal will be modulated.

The signal from the Sine LFO is fed into the Audio In of a Simple Amplifier, and the same voltage as that sent to the LFO's FreqCV is fed into the Env In . At the Audio Out, we have a pseudo-sinusoidal signal with variable frequency and amplitude.

Modulations :
By setting the LFO's Freq modulation amount to 0%, there is no longer any variation in frequency. Setting it to negative values results in acceleration, while setting it to positive values results in slowing down.
However, it is not currently possible to modify the amplitude variations. To do that, install a Linear Crossfade module, also from Dome Music Technologies ; connect a +5V input to Input 1, and the cable that came into the Simple Amplifier's Env In to Input 2. Return the main out of the Linear crossfade to the Env In of the Simple amplifier. Now, by turning the Linear crossfade knob from left to right, the amplitude variation will range from 0 to the Sample & Hold value.

Even more random : add two or even three LFOs!
Load a second LFO, a second Simple amplifier, and a second Linear crossfade.
The attenuator is triple. Patch the second like the first: +5V and the Sample & Hold of the second LFO as input, attenuation of 50%, output patched in the Freq CV of LFO 2.
You can start again with a third LFO, a third Simple amplifier, and a third Linear crossfade.
Use a new Attenuator module to input the three audio outs on the same jack, and attenuate to 33.33%, to let the max voltage at +/-5V. Send the output to a low-pass filter set to half the average frequency of the LFOs (for example, 0.5 Hz) that will be like a time constant.

What did I do with it? a piece that I called "Eliane's Combs" that you could hear here !