wet dry knob help

Nu Audio Science · 17 Oct 2009

Connect a dial to a multiplier (amp) Then invert the output from the same dial and connect it to another multiplier (Amp) Now when one goes up the other will go down 😉

NAS

MichaelBenjamin · 17 Oct 2009

assumed all your control values are between 0-1, for a simple wet/dry you multiply your wet signal with the control value (0-1) and the dry signal with the inverted control value (1-0). to invert a control value, subtract it from 1.

example in code:

streamin wet; streamin dry; streamin ctrl;//control value between 0-1 streamout mix; mix=wet*ctrl+dry*(1-ctrl);

oddson · 17 Oct 2009

The simple non-code method:

It assumes a control input in the [0,1] range.

It's essentially the reverse of a simple stereo pan (x and 1-x become signal multipliers).

And like a pan control you may find the apparent volume does not stay stable while sweeping through the range.

You can search here and elsewhere for 'panning law' if that is an issue in your application.

pawn1one · 18 Oct 2009

Thanks again guys I conected it up & it works great the code and the noncoded version are the samething I'm guessing, I just understand the noncoded vesion better. does the coded version use less CPU?

I still dont get some things about it though...

I get that srteamin wet, dry and ctrl are the inputs and streamout mix is the mixed Output and that wet*ctrl is the streamin wet multi by streamin ctrl and then we add the dry signal.

the part that I lose it on is the dry(1-control); "is this the floating point data?"

what does this (1-control) mean? and is the //control value between 0-1 just a note from Micheal

speakin of the floating point data, how do you know how to hook it up is there some general rules to follow? What would changing the # in the float do to the knob?

MichaelBenjamin · 18 Oct 2009

for example if your knob is at mid with a value of 0.5, then the dry signal gets halved in volume (dry*0.5) and the wet signal also gets halved (1-0.5)=0.5, so 0.5*wet. if your knob outputs 1, then the dry is is full volume (dry*1) and the wet signal is at zwero volume (1-1)=0, so 0*wet.

if you are unsure what things do, connect some readout boxes (press f) and the mono stream analyser for stream data and look at the numbers. oddsons example is much better to get the basics. the code version however will use less cpu in general, and for every stream data you should merge and optimize the code to get near a reasonable cpu use, but its not very important at the start. note that everything green in sm is only processed on demand, so it practically uses 0% cpu.

ah and yes, everything after // is ignored by the computer so you can write comments

sunsynth · 18 Oct 2009

Hi,

Michael please correct your code:

streamin ctrl; => mix=wet*control+dry*(1-control);

MichaelBenjamin · 18 Oct 2009

yes this was a typo, now i understand your confusion.