[sdiy] avrsyn code / more pots

[Gabriel Lindeborg]

I suggested this in a previous posting and concluded, w. Jarek I think, 
that this would be a different synth than the low component count AVRSyn.
But if we follow this train of thought I suppose the nine lines used for 
switch scanning could be used to address multiple 4051s, both for 
scanning pots and switches. Question is how many multiplexed lines can 
the extra capacity of the ATmega running at 16MIPS, or better still a 
20MIPS ATmega, muster to scan w. reasonable latency?

I also think that an added feature of being able to control external 
analog filters for example via DACs connected to the SPI.

Still, sounds like an AVRSyn DeLuxe to me, but that should not stop us.

//Gabbe



Jaroslaw Ziembicki wrote:

>>>I don't think there are any spare knobs for the resonance control but
>>>perhaps you could use a spare switch to select what function a certain
> 
> knob
> 
>>>is controlling. When the avr reads the knob values, it could check a
> 
> switch
> 
>>>value then load the knob value into the correct location based on the
> 
> switch
> 
>>>setting.
>>
>>I had this idea as well. Maybe use two switches as a "page select". The
>>code would have to keep an extra copy of all switch and pot settings
>>and only update the real parameters when an input changes. Another option
>>is to MIDIfy all of the parameters. I might do this in preparation for
>>another project I'm working on.
> 
> 
> I don't like the idea of using one pot for two or more parameters.
> What about using a multiplexer (4051) and have 7 additional analog inputs?
> Of course in such case you have to sacrify 3 I/O pins as control lines for
> 4051.
> 
> Regards, Jarek
> 
>