Korg Poly800/EX800 Users

Don't seem to be able to get to the electricdruid pages. Maybe they're down or maybe I have a problem. I shall check 'em out again tomorrow.

Mike



On Thursday, May 29, 2014 8:34 PM, "bperkins211@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:
 


  
Take another look at Tom's VC DO
VC'd wavetable monosynth, basically.


http://www.electricdruid.net/index.php?page=projects.vcdo


we can use his code, here
http://www.electricdruid.net/code/VCDO1.ASM
and modify it to drop unneeded VC inputs.
Change them into a bus port and select lines.


PICs are very simple to config.  They are RISC Harvard Arch. 
we can port over code to a larger chip if we need more ports to config.

You can read his code to get an idea of the formula's he's used and his conversion of the wavetables to a PWM output..  evidently it's a high Hz and needs filtered to sort out the Audio.

Looks like it's not setup for a VCA.. guess we could do that separate using an example circuit from other synths if needed.. or use an off the shelf VCA chip.


Would you be using S&H methods to distribute VC's out from the DAC with a 3 to 8 decoder or some method like that?




Google "Knowles Know It All PIC microcontroller" to find a posted PDF of a very good book on PICs to evaluate.  I liked it so much that I bought a book copy on ebay for cheap..  which I highly recommend for you as well.. these are great little devices.