General
Equal Power Crossfade
Started by vanceg on .
Sign in or create an account to join the conversation.
Does anyone have a handy formula for an equal power crossfade curve?
What I'm trying to do is set up a fader that has a single MID output. I want to then send the MIDI from that fader to two audio faders, inverting one of the MIDI signals (so one is 0-127 and the other is 127-0) and achieve an equal power crossfade between the two audio channels.
I keep plugging formulas like "round((Fader.x^0.5)*126+1)" into the Value field of custom MIDI objects...but that just isn't working - I get a "hole" in the middle when I fade between the two audio channels. I am sure I'm just not using the right formula yet. What's the RIGHT formula?
What I'm trying to do is set up a fader that has a single MID output. I want to then send the MIDI from that fader to two audio faders, inverting one of the MIDI signals (so one is 0-127 and the other is 127-0) and achieve an equal power crossfade between the two audio channels.
I keep plugging formulas like "round((Fader.x^0.5)*126+1)" into the Value field of custom MIDI objects...but that just isn't working - I get a "hole" in the middle when I fade between the two audio channels. I am sure I'm just not using the right formula yet. What's the RIGHT formula?
Edit: Attachment Removed.
Reason: My example was linear, not constant!
-Damien
Reason: My example was linear, not constant!
-Damien
Hi Vance
Starting from something like this as a standard equal-power crossfade formula
// starting with pan range of -1 to +1,
float angle = (panRange+1)*(0.25*PI); // range 0 to PI/2.
float leftAmplitude = cos(angle);
float rightAmplitude = sin(angle);
You might end up with something like this
EqPowXFade.jzlib
You would need to interface this to your MIDI as required.
Hope that helps
MM
Starting from something like this as a standard equal-power crossfade formula
// starting with pan range of -1 to +1,
float angle = (panRange+1)*(0.25*PI); // range 0 to PI/2.
float leftAmplitude = cos(angle);
float rightAmplitude = sin(angle);
You might end up with something like this
EqPowXFade.jzlib
You would need to interface this to your MIDI as required.
Hope that helps
MM
Thank you.
Indeed - I know this formula but was having a heck of a time figuring out how to implement it. And went for one I DID seem to know how to do.
I will try to run this with the Y value of a Multiball taking the place of the Multislider.....because what I'm REALLY trying to accomplish is create a simple surround panning system for the weird way in which I use Live.
Vance
Indeed - I know this formula but was having a heck of a time figuring out how to implement it. And went for one I DID seem to know how to do.
I will try to run this with the Y value of a Multiball taking the place of the Multislider.....because what I'm REALLY trying to accomplish is create a simple surround panning system for the weird way in which I use Live.
Vance