Multiplier - polarizing VCA

[BugBrand]

aka 4-quadrant multiplier or "ring-modulator"

Just added to the new site: https://www.bugbrand.co.uk/product/multiplier/

I had a bit of a hard time simply describing it!
When you use two modulation inputs along with the offset control you can do a lot at audio or sub-audio rates.

Effectively, you've got the sum of Initial + the 2 Modulations ---
when this sum is 0V you get zero output
when this sum is +5V you get x +1 amplitude output
when this sum is +10V you get x +2 output
when this sum is -5V you get x -1 output
when this sum is -10V you get x -2 output

[hollunderkurve]

this looks wonderful

[northerntao]

Ah, you mentioned this was coming! Didn’t realize it was so quick!

Maybe next year! Have so much to explore with what I have!

[Kafgee]

perfect timing

[BugBrand]

Ah, you mentioned this was coming! Didn’t realize it was so quick!

It has actually been done for a month or two - I just wanted to complete the new website before putting it out + the general time chaos the last months.

[lud]

Very interesting and intriguing design there Tom. Must sound crazy with 3 audio rate signals!?

[rpc]

Looks great Tom! Can’t wait to hear what it can do!

[chrisdermo]

Hot diggity dog! Looks verrrrrry nice

[chrisdermo]

On the old DD1 we have 2 ins and one out with a level control on each input, using the ‘RM’ setting would it be the same result as feeding the same signals to the yellow input and one blue input on this module? Or is the circuitry a bit different?

[BugBrand]

Circuitry def a bit update but, yeah, similar ball park.

Effectively, you've got the sum of Initial + the 2 Modulations ---
when this sum is 0V you get zero output
when this sum is +5V you get x +1 amplitude output
when this sum is +10V you get x +2 output
when this sum is -5V you get x -1 output
when this sum is -10V you get x -2 output

[jjsynth]

Great looking module

[chrisdermo]

Circuitry def a bit update but, yeah, similar ball park.

Effectively, you've got the sum of Initial + the 2 Modulations ---
when this sum is 0V you get zero output
when this sum is +5V you get x +1 amplitude output
when this sum is +10V you get x +2 output
when this sum is -5V you get x -1 output
when this sum is -10V you get x -2 output

thank you

[shred]

looks great! would love to hear some sound samples if possible

[T. Jervell]

Ooohhh..... nice one!!! Crossing my fingers I’ll find a way to incorporate this one in my system

[Tajnost]

Cool!

Wondering if it can work with clock signals (probably no, but... )?

[Sir Ruff]

Very nice! I understand that ring is possible with the dual VCA, but having a dedicated module is ideal.

[BugBrand]

Cool!

Wondering if it can work with clock signals (probably no, but... )?

Yes - DC coupled, though inverted output would become 0 to -10V so possibly of little use?!

[chrisdermo]

Anyone received one of these yet? Wanna hear some samples!
One of these in conjunction with an LPG on percussion duties

[joncharliefeathers]

I have one and a low pass gate in this 2x 11FW synth voice. Tell me how you want it patched.

[???]

Well I'd be curious with anything, slow and audio rate modulator (3-4 octave higher than carrier). Random pitch on both carrier and modulator. Slow modulator sweep. I'd really like tonal stuff too. I'm very curious about this module! Also 2 modulator!

[BugBrand]

Yeah, I started doing some recordings but got a bit lost... did finish the LPG ones at least but that seemed a clearer remit (eg I tried with two modulators but frankly it was hard to convey what was going on!)

[joncharliefeathers]

A compact vco into the multiplier then on to the lpg. 2nd Compact vco in to multiplier on mod 1. Sine and looping env DC mixed to Penrose for pitch and gate out to hit input on LPG. That's the basic, followed by wave shaping and other changes all on the fly.

[???]

Hahaha cool love it!!! Thanks a lot!

[joncharliefeathers]

Thank you! I never tried ring modulation so was good to learn something new. There are some excellent tones to be found. And the second mod input on the multiplier was useful to introduce more bass punch together with some initial offset.