tapout~

A stereo spatialization effect can be achieved using x,y coordinates to determine intensity and delay for the sound at each speaker at each moment. The hypothetical listener is placed at a point equidistant from the two speakers. The speakers are each assumed to be at some angle from the listener between 0 and pi radians, with 0 radians being straight to the right, pi/2 radians being directly in front of the listener, and pi radians being to the left.

This abstraction encapsulates delay, gain control, and stereo panning in a single object that can be used in some other "parent" patch. It assumes that its first inlet will be connected to a tapin~ object in the parent patch. That tapin~ object will send a tapconnect message when MSP audio is turned on, thus linking the tapout~ object in this abstraction to the memory buffer of the tapin~ object in the parent patch.

For this example to work properly, you will also need to download the additional Max file mix~.maxpat from the example “A use subpatch for mixing and balancing two sounds.”

For this example to work properly, you will also need to download the additional Max file "mix~.maxpat" from the example "A useful subpatch for mixing and balancing two sounds", which will be used as a mix~ object in this patch.

Audio delay is achieved by creating a buffer in which the most recent past sound can be stored. Usually this is called a "ring buffer" or "circular buffer", because when the buffer is filled (with, let's say, the past one second of sound), it loops around and begins refilling itself at the beginning, thus overwriting the sound that was stored more than one second ago.

If we want to use the delay crossfading technique shown in "Abstraction for crossfading between delay times" for multiple different delays of the same sound, the simplest solution is just to make multiple copies of that abstraction and send the same audio signal to each one. However, that's a bit inefficient in terms of memory usage because each subpatch would have its own tapin~ object, each of which would be containing the same audio data.

This patch demonstrates the use of the abstraction in "Abstraction for crossfading between delay times". It requires that you have saved that abstraction with the name delayxfade~.

This example shows my preferred method for changing between different fixed delay times. It's an abstraction that I regularly use when I want a simple delay, and want the ability to change the delay time with no clicks or pitch changes. It's designed as an abstraction so that it can be used as an object (a subpatch) within any other patch.