Would really appreciate some help. I want to build a synth where each tone generator/oscillator module has waveform selectors in the form of 6 toggles and a horizontal slider with 6 values, ranging from (left to right) my saw(ramp down), square, rev. saw(ramp up), triangle, sine, and noise~. I have other things I would like to modify like making the oscillators polyphonic, pulse width, modulating crossfader and other params, etc. this crossfader seems to be a unique and difficult task for a noob like myself.

img of patch attached, i welcome any other thoughts as well. obviously i know only one osc is connected to dac~ in my img.

Many thanks

@xjjacobx Like this? The slider will fade from one waveform to the next and the radio will jump from one to the next?
scanner.pd

On startup it creates a cosine wave in array $0a1 and then copies the first 90 degrees to the first 64 bits of array $0a2 and the last 90 degrees to last 64 bits of $0a2, each channel looks up its volume level in the $0a2 with each being offset by 100 more than the previous, opening the arrays to peak at their waveforms should help in understanding. We could also calculate the value for each channel instead of looking it up in an array but I believe this is more efficient? but a bit more work to tweak for varying number of channels.

There's a lot of approaches - one thing I really like is to go check out the [else] external - it has objects that can help you just do the thing you want and the Live Electronics Tutorial that comes with it is a really helpful interactive walk through of a lot of topics. You can interact with things, see them and hear them. Because it's a compiled external vs vanilla externals (which are just made out of vanilla objects like [mkmr] or [audiolab] which you should also check out) it's harder to port what you make (you have to install it each time with different types of computers) But it will save you so much time starting out

Finally figured out the stupid flaw in my first attempt, although I am not completely certain as to way it did not work as was.
scan.pd

Edit: bugfix, screwed up when cleaning up the patch.

the image from fishcrystal contains an important, basic part of the answer in that plot: the math required for a multi-point-crossfader is identical to the math in a "equal-power" stereo panner.

using modulation -> list -> modulo -> cos function, as seen above, is a nice short data rate implementation.
if you want to use signals, where you dont have lists, you can optimize that principle further by using buffers and then only use +- offsets when reading out the function for the different inputs.