Jason Orri

Hi all, I'm having trouble thinking on how I might implement a crossfade between four different audio files - so that I could use a slider from 1 - 127 and as I scroll across sound one fades in and as I continue sound 2 fades in but sound 1 fades out as this happens continuing upto sound 4 at the far end being the only sound heard... I hope that's clear.

I have tried using a number of crossfading examples from the forum but all deal with the idea of panning but in reverse: 2 inputs and I need four... can anyone help?

Hi all, I'm having trouble thinking on how I might implement a crossfade between four different audio files - so that I could use a slider from 1 - 127 and as I scroll across sound one fades in and as I continue sound 2 fades in but sound 1 fades out as this happens continuing upto sound 4 at the far end being the only sound heard... I hope that's clear.
I have tried using a number of crossfading examples from the forum but all deal with the idea of panning but in reverse: 2 inputs and I need four... can anyone help?
J


crossfading-between-4-audio-files

the only problem about this is the GUI - if you starting thinking within the limits of a 2-dimensional GUI object, you have lost.

to crossfade between each of 4 channels you need a symetric pyramid - the rest is nothing more than an addition of the results of linear fades between the 4 points of the pyramid.

how to make a usable GUI interface for that? no idea.

Yeah, I can envision that and it makes a good deal more sense than the 2d... surely it must be possible!

Have a look at the fun tab of the nodes help file. It's quite straight forward to adapt it to fade between sound files.

Nodes gives a quite elegant solution for a 2D-interface. You can also think about multichannel panning laws like vbap, which in this case do exactly what you want, assuming that the speakers are on a circle.

But I guess that Jason was initially looking for a 1D-solution, for example if all speakers are on a line, controlled by a 1D parameter only. In this case here is an example of solution:

The key is the use of "min" and "abs" in the expressions, so that all coefficients are constrained between 0 and 1. The square root aims at providing a constant power to the phantom source (-3dB law).

yeah, nodes is 2d ... a fade between 1 and 2 will be something else than a fade between 1. and 3.

yeah, nodes is 2d ... a fade between 1 and 2 will be something else than a fade  between 1. and 3.


crossfading between 4 audio files