Patch Storage (was Re: [sdiy] Monosynth features poll)

[Ian Smith]

I think I might like to get the thing working in analogue first before trying to mess with memory... baby steps... I think this year is for getting all the various circuits playing nice with each other and assembling the prototype and next year can be for dealing with patch storage and making the whole synth look pretty.
 
And I'm fairly certain I'll have more questions along the road.
 
-Ian (again in over my head) Smith
 
 
> On 29 Jan 2010, at 16:17, Dave Kendall wrote:
> 
>> P.S. FWIW, a DIY synth Patch storage solution for mere mortals like 
>> me without coding experience, has long been a unrealised dream... ;-)
> 
> It's not an easy thing to pull off, although it isn't complicated 
> either. Assuming we're not going entirely digital, it implies certain 
> things about the circuit which is having its settings programmed;
> 
> 1) All variable parameters must be controlled by CVs. You can't put 
> any pots directly in the circuit.
> 2) All switches must be replaced by analogue switch ICs or something 
> similar and controlled by digital logic signals.
> 
> These are the basic rules for programmable synth voices, and examples 
> are numerous (any programmable synth from the Prophet5 onwards 
> through the 80s).
> If these two rules were adhered to, and better still if some standard 
> were adopted (0-5V CVs and +5V logic say), it would be fairly 
> straightforward to build a system that could read X pots producing 
> 0-5V CVs and Y switches giving either 0 or 5Vs and then output those 
> signals via a multichannel DAC (or equivalent) and some output 
> latches. This scheme has the advantage that it ought to be possible 
> to make it "invisible" - e.g. unplug it and plug the control panel 
> straight into the synth electronics and use the synth without the 
> memory feature.
> Obviously the memory PCB would have to have a microprocessor on it, 
> but if there was one such project in the world, everyone who wanted 
> to could get the PCB and start adding memories to their stuff without 
> having to actually learn any coding or mess about with uPs beyond 
> putting one in a socket on the PCB.
> 
> This was the scheme I originally had in mind for my monosynth 
> project, but I've gone all digital since then, so the panel talks to 
> the guts via a serial link now.
> 
> T.
>  		 	   		  
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