modulating parameters

Hi,

I am having trouble modulating a parameter that goes from -15 to 15.

Because when its dial is centered it is 0 so any modulation is also zero.

the output from the lfo is +1 to -1 so it only works when the dial is at +15 or -15.

How do you modulate a parameter like this?

 

there are many many possible ways to modulate. it sounds like you are multiplying an LFO by a knob. when using LFOs i prefer to add them to the parameter and then clip the result to whatever range you desire.

uploading a pic of the structure might be helpful if you need something more specific.

 

In particular this 15 to -15 parameter is the size dial in a formant filter.

I have actually hidden the controls and slaved them to the standard cutoff, res and bw.

pic 1 is the res, pic 2 is the formant filter where res is the 15/-15 parameter.

 

right, so you're multiplying. i really think you want to be adding. i would change the value of the LFO to go from -15 to 15 (or multiply it by 15 or whatever) and then add that to the value. then clip it (ie make sure that the LFO plus the value is in the range from -15 to 15)

 

I went back to the normal cutoff for clarity (pic1) because I am missing some understanding.

So when the cutoff dial(0-1 range)l is at max and lfo mod is full then the output is 0-127. Thats is right? But when the dial is at minimum the output is -63.5 to 63.5. Which makes sense, but it should'nt it also be 0-127?

i had previously saved this 'scale const' macro (pic2) (I cannot remember where its from).

But it doesnt seem to work for 0-1. but i changed the 0.00.... digit to 0.5 and that was ok. Do i have to change the top digit to the middle, is that what it means?

I had a look at ni's massive and cutoff at minimum with full lfo seem to go to 0 to 75%. and with cutoff at full seems to go correspondingly from 100% to 25%. ie not 0-100%/100-0%.

What i am aiming for in my synth is when the cutoff is full and mod depth is full then it goes from 100% to 0% but when the cutoff is at minimum and mod depth is full then it goes from 0% to 100%

I am confused.

 

i added this and it works like 100-0%, but it doesnt matter where the dial is.

So i guess i dont want that.

 

I've gone to this now: pic1.

Which when the dial and mod is full, ranges 127-0, but when dial is 0 and mod is full, ranges -63.5 to 63.5.

So how do i make that 0 to 127?

 

add 63.5 to it when it's being modded?