Let's say you wanted to add a sample of a morphed voice that has been put through a vocoder on the PC. This is a great way to allow one to do that with the ADC and allow them to add anything else they have stored in their wavetables with the DACs.

Also, let's say one has a pure digital mix of 3 or more sin waves in different octaves. You can put the original through one channel, put another copy of the original a few degrees out of phase on another channel, another copy of one a few more degrees out of phase, and so on. Sample that, put it back into the DACs and start the process all over again.
Point being, sin waves are one thing but a complex sampled waveform like a morphed voice is another. Granted it will add noise the more times you do this, but it will be interesting to see just how much noise... Like 2 mirrors pointed at each other, slightly offset, and the sample is in the middle.

Also, with the digital pots, one could simulate attack/sustain/decay/release like the C64 6581 SID, which has been replicated by a Microchip or Atmega device. I will search for it...

Original datasheet Here...
Some links to 6581 projects Here...
There is one other site, dedicated to 6581 replication. I will continue looking...

In the mean time some cool stuff:
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SWINSID, that's it!
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Originally, from bound:
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65Org16:https://github.com/ElEctric-EyE/verilog-6502

I've been looking at some frequency generator IC's on my spare time the past couple weeks, more specifically the DDS (Direct Digital Synthesizer's) family from Analog Devices. The ones I've been looking at could be used for audio if they were run at slower speeds, but the output range can go up to 400MHz. Automatic/programmable sweep, programmable internal RAM for custom waveforms are but a few of the features of the AD9910. It is a 3.3V CMOS 100-pin QFP Device. This particular device can be programmed at 100MHz with a parallel i/f...

I'm still familiarizing myself with the datasheet, but it looks awesome so far.

Just to let everyone in on a secret, I actually bought all the IC's I need for this audio daughterboard (I have a fear of part non-availability, so when I had the money I bought a few here and there), not including the Analog Devices IC in the last post. I can picture using that one in a car project, one that involves alternate fuel, i.e. hydrogen, created from the splitting of H2O. I've done this easy enough using straight DC already, but when one can approach frequencies into the GHz, I theorize the splitting of +H and -HO becomes much more abundant with much less power in... But that's for another day, most likely in another forum...

The Linear Technology QFN packages worry me. The 50MHz 16-bit ADC LTC2202 is a 48-pin QFN with .5mm spacing. The LTC 6403-1 is a 16-pin QFN with .75mm spacing, it is a output amp that converts a single ended input into a differential output which is needed by this ADC.

OK, I'm going back to the software on the Devboard!...

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Continued O.T.: Fascinating isn't it? H2O is burned Hydrogen (does it implode, explode, both?)... Tax free H2O that is... But, I get the flavor of your post Garth. Let me just say I am not one of these "free energy" people. There is no perpetual energy machine, not on planet Earth anyway, however there are machines bound by gravity that are closer to perpetual than others. I am in search of the one that is closer to the "impossible". Resonance and feedback loops are ideas I would like to pursue. In this regard what is the natural oscillation of the H and O atoms? I've read >13GHz. If you can just begin to approach this frequency, it would most likely be more efficient than brute force 2V DC was my only point.

EDIT: I've read today the natural resonance for a Hydrogen atom is 14.5800 MHz, but this is not a molecule of water... Interesting read here.

And, if you would've told someone ages ago that you could break a piece of glass by using a single frequency through a loudspeaker, they probably would have doubted you.

Back to On-Topic Digital Sound Synthesis.

There are no such things as coincidence which is why I post now... Recently I had brief 2 post rant, towards the bottom ofanother thread regarding the 2012 Olympics being held in London. This made some of us think of all that is good with Britain. Anyway, I had further diverged off-topic regarding British music, namely Pink Floyd.

For the D.S.S. board I aim for something similar to what I came across today. One of these devices was actually used by Pink Floyd! It's a digital audio building block made for the PC. Pure digital now though.

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65Org16:https://github.com/ElEctric-EyE/verilog-6502

This DSS board will have an optical SPDIF output...

I plan to open this unit up and see what IC's they use. The one I've been using for over a year, but only yesterday successfully got the optical SPDIF output working with MP3 audio I have stored on an external USB HDD, is a nice piece of equipment for the money. I bought a separate piece of equipment that strips audio from an HDMI source into SPDIF, but that doesn't seem to work yet for some reason, which is what sort of delayed my enjoyment of optical streaming digital audio.

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65Org16:https://github.com/ElEctric-EyE/verilog-6502

I haven't opened up this product yet, and probably won't.

I have found a nice family of Audio ICs made by Analog Devices that can take multiple SPDIF inputs and perform 3000+ operations per sample @172MHz. There is software for controlling the audio DSP...These IC's could be 8 channel SPDIF QFP IC's suitable for injecting programmable sound effects into the multichannel SPDIF output stage.

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65Org16:https://github.com/ElEctric-EyE/verilog-6502

Chuck T mentioned some audio products in another thread. I've not had a chance to check them out yet, but thought I would post here for future reference.

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65Org16:https://github.com/ElEctric-EyE/verilog-6502

There isn't a datasheet for this the last time I looked. It is a vacuum tube on a chip and they are in the synthesizer, digital piano, etc., business.

http://www.korg.com/us/news/2015/012212/