[sdiy] Request ideas for a digital-analog synth

[Mario Rui Luzeiro]

Hallo there! First post here!

I've starting reading about DIY synths and I'm plan play 
with my own. I've found nice pages around web, i'm studing 
the schematics and so on.
I've some ideias of what I want and I'd like know if you 
would like share and give me any sugestions for this:

Firstly, I'm not play doing a real analog synth, but some 
hybrid digital/analog control.

I'm planning use a microcontroler to control and play with 
analog part.
With PIC I can get: 10 MIPS, PWM (8..10bits), ADC >50ksps 
10bits, comparators, IO ports, and so on.

I dont like much the idea of using a DAC because I dont 
have so uch CPU power to play with and to all in the CPU, 
but I can use some kind of "resistor DAC" to control some 
levels, maybe pwm to control some LFO voltages, etc
What's your opinion about "resistor DACs"?

I would like my circuit will not be too much complex, 
because I plan then add paralell voices, replicating the 
circuit, but I dont want it so simple because I would like 
play with lot of parameters and haver rich sounds

I'm not interested also in audophile quality assegurance, 
firstly I want just some nice noise :)

The main goal using a microcontroler is to let the micro 
produce some kind of sound, or play wish diferent 
waveforms, maybe selecting them or guide them (waveguide?) 
and minimise the use of external components. In the 
schematics I'me learning in web, they are more focus for 
>all real< analog synths:

What do you sugest I learning and looking for? What ideas 
do you think I can explore using the microcontroler and 
analog?

I've found about 1 ou 2 projects using microcontrolers, 
but they seam too simple to mee, just "tri,saw,sqr" 
waves->Filter->envelop

Idea: If I use two separate "8bit or more resistor DAC" 
(resistor so we can haver different level because resistor 
tolerance) to play "two voices" an then put it to 
filter,efx,etc... will output listened sound less "8bit" 
?!


Thanks in advance for sugestions!!
Mario "KammutierSpule" Luzeiro