Cross fader?

stw · 9 Sept 2008

like that?

sequencer · 9 Sept 2008

A normal Cross Fade (0 dB) will fade the first clip out, while simultaneously fading the second clip in. This effect applies a linear ramp to the volume level and will give you a volume dip in the middle.

Cross Fade (+3 dB) will perform the same operation as Cross Fade (0 dB), but it applies an equal-power ramp to the volume level and thus you do not get the dip.

An Equal-power fade uses a quarter-cycle cosine fade-out curve and a quarter-cycle sine fade-in curve, thus maintaining the output signal power at a constant level.

I found this info on the web (it is not a direct quote) , hope it helps.

Sorry I can't help with the osm, have not been here in a very long time and would be unable to correctly build something I think.

Good Luck...

Dunc 🙂

nix · 10 Sept 2008

Thanks very much folks, Nice one stw, this helped. I see it pans as well, or that was just how I set it up? Thanks for the background info sequencer. So what I started modding was a normal crossfader. Anyway here is the working schematic->

And it was pretty simple in the end, I don't understand why this one doesn't dip in the middle of the fade though->

Thanks, Nick

nix · 10 Sept 2008

Thanks for your reply oddson, Are you editing it? I tried the pitch shifting and turned up the dip. It is not as noticeable as the original crossfader I was using. The correct function would be appreciated, I would use it in an update of my multi FX. Wishing contents, nix

oddson · 10 Sept 2008

As you saw I posted and deleted... I get mixed up on this issue vs. 'panning law' because they are essentially opposite sides of the same coin and because I have a great deal of trouble with dB math for some reason (even though it's not all that complicated, I just have a mental block).

I did a four-way cross fader for someone and it's on the forum somewhere. It used a 'convex/concave' control to allow you to implement +/- 3 dB centre boost.

Here's a two-way version:

The small knob controls the convexity of the cross-fade curve. Right-ward gives greater mid boost, Left-ward it less or even gain reduction (so it could be used for a panning law). [Note the min/max on the control are reversed to give the expected directionality to the control as smaller exponents give greater mid-point gain.]

I had a bunch of stuff written about the dB gains involved but I'm pretty sure it's all garbage so just play around and find an exponent that works (it will be at or near 0.5) and you can replace the small knob with a constant if you wish. If I can figure you the dB math I'll post a better version that displays the panning law/cross fade rule it's representing.

nix · 10 Sept 2008

Thanks very much again 😀 (stw and Sequencer also), Around .5 seems close enough by ear and also on my levels meter. I'll pass it on. This is a really nice component if your routing is complicated. Your my projects' saviour, oddson. Wishing contents, nix

nix · 11 Sept 2008

Hey again, Here is a version with simple GUI->

and the .osm->

I've passed it on. This has limited use as a VST because it has 2 stereo ins, I think few hosts support that. It is a really handy one for me in SM though. Wishing contents, nix