Hi everyone, I’m looking for a module that can add and substract in hz from oscillators. Just so I can, for example, have a 4hz beat from a 100hz oscillator, where one output is substracted 2 hz (98hz) and the other added 2hz (102hz).
And no, I don’t want to just have two oscillators with those frequencies for reasons that are beyond the scope of this Topic.
By finding a module that can add-substract, the possibilities expand exponentially.
Thanks
Use 2 frequency shifters in parallel?
I didn’t know that module - I would have done this:
log2((((261.626*pow(2,w)) - 2)/261.626))
log2((((261.626*pow(2,w)) + 2)/261.626))
^change this for beat freq.
261.626 is the frequency of the oscillator base frequency in Hz - the standard in VCV is C4=261.626 Hz (= 0V).
https://vcvrack.com/manual/VoltageStandards#Pitch-and-Frequencies
If you turn the fm in fully up, I believe it is v/oct (which is a ratio)
I don’t think there is a standard for fm in VCV Rack - some developers may make linear FM - some logarithmic FM. You have to look in their manual or ask for a specific module to figure out the relation between voltage and frequency.
1 V/Oct is a standard in rack Voltage Standards - VCV Rack Manual
To use the NYSTHI LFO … I would set the frequency to C4 261.6256 Hz and the “FM CV VCA” to 1. then you can input 1 V/Oct to the FM.
I have never used it as a VCO though…
Thanks Jens, much appreciated.
btw, can I import an equation like
Zn+1 = Zn * sin (Zn)
in there?
I tried but it isn’t working.
try:
w * sin(w)
But hey, don’t know exactly what it means? (what is n - and Z0) ? I’m quite bad at maths, studied maths and chemistry but failed maths miserably at university.
I can’t think of a way to turn that into waveforms.
Ah the famous Mandelwave, where you can keep on zooming 
I think that’s a simple ring-modulator, yes?
Maybe… I never thought of it like this 
I will do some simple tests. Thanks!
yes, a frequency shiftier is usually a ring modulator with a bunch of extra stuff to turn the two bands into one. If you just want to two bands then it’s easy.
if you have two freq, f1, and f2, a frequency shifter will output f1 + f2 or f1 - f2. a ring modulator always puts out (f1 + f2) and (f1 - f2).
In case it isn’t clear, “ring modulation” is AM, and frequency shifter is “single sideband modulation”.
Don’t know if this is what you’re asking for, but you can use the “Alikins::Specific Value” module. You can type directly into the “HZ” textbox:
In most oscillators you can also type a frequency directly, by right-clicking on the frequency knob:
