[sdiy] Top Octave Modular

[Elain Klopke]

So, more stupid questions.... In having 8 octaves of notes to switch to 8
busses, each with their own switch, that's 832 switches to control. At
first I thought that daisy chaining 74HC595s would work, and it probably
would, but there has to be a simpler way of controlling all those switches.

CPLD, FPGA, Raspberry Pi?

I'm getting pretty comfortable with the analog bits of the design (except
maybe being a little fuzzy on  how to turn the 0-5V output to something
centered around 0V that other modules would be expecting), but the
programming bits of this are still over my head.

I am, however, learning so much from you guys!

-Ian

On Sun, Apr 2, 2017 at 4:58 AM, Elain Klopke <functionofform at gmail.com>
wrote:

> Oh, ok, here's another question... Would it be better to have square wave
> outputs (what comes from the NoteDiv chips) or convert the square waves to
> saw waves between the NoteDiv chip and the switch matrix?
>
> -Ian
>
> On Sun, Apr 2, 2017 at 1:04 AM, Elain Klopke <functionofform at gmail.com>
> wrote:
>
>> The Chord Organ does look like a good start. I'll poke and prod at things
>> to see how it goes. Thanks guys!
>>
>> On Sat, Apr 1, 2017 at 4:58 PM, Quincas Moreira <quincas at gmail.com>
>> wrote:
>>
>>> I was gonna say the same about the Chord Organ!  I have one here, it
>>> will be the next Kit Review on my channel, up next week, which will
>>> coincide with Thonk having them back in stock.
>>> Easy way to do paraphonic organ-like polyphony :)
>>>
>>> Cheers
>>>
>>> On Sat, Apr 1, 2017 at 2:26 PM, Kylee Kennedy <kmkennedy at gmail.com>
>>> wrote:
>>>
>>>> Sounds fun! You should try the Chord Organ firmware for Tom Whitwell's
>>>> (Music Thing Modular) Radio Music for some more inspiration.
>>>> Might be a good place to start to see how easy it works with arduino.
>>>> This ones Teensy based.
>>>> Cheers,
>>>> Kylee
>>>>
>>>>
>>>> On Saturday, April 1, 2017, Elain Klopke <functionofform at gmail.com>
>>>> wrote:
>>>>
>>>>> I think it could be done with an Arduino. It may need to be a Mega,
>>>>> but after seeing some of the LED matrix projects, some 74HC595s would work
>>>>> to control the switches, I'm sure.
>>>>>
>>>>> On Sat, Apr 1, 2017 at 2:35 PM, bill bigrig <billbigrig at yahoo.com>
>>>>> wrote:
>>>>>
>>>>>> This would certainly be a intriguing project. Could it be done on an
>>>>>> Arduino or 2? Or would one need to go to a higher system like
>>>>>> raspberry?
>>>>>> Rig.
>>>>>>
>>>>>>
>>>>>> On Saturday, April 1, 2017 11:39 AM, Elain Klopke <
>>>>>> functionofform at gmail.com> wrote:
>>>>>>
>>>>>>
>>>>>> So this is another one of those instances where Ian/Elain has an idea
>>>>>> that combines several branches from various thoughts bouncing around and
>>>>>> kinda crashing together in a messy heap. I blame my tenure at Art School
>>>>>> for this design process.
>>>>>>
>>>>>> I've always wanted a modular since I first stumbled upon this hobby.
>>>>>> Lack of space, time, or money has always stopped me. I've also always
>>>>>> wanted an organ. Mostly a lack of consent from the significant other and
>>>>>> space has quashed that one.
>>>>>>
>>>>>> So here we go again. I have Tom Wiltshire's amazing little NoteDiv
>>>>>> chips and things keep not panning out for the stand alone paraphonic synth.
>>>>>>
>>>>>> I keep thinking about how the Hammond and the string synths have
>>>>>> discrete chunks that make up the whole thing. tone generator, filters,
>>>>>> vibrato, chorus, etc. So why isn't there a top octave tone generator module
>>>>>> yet?
>>>>>>
>>>>>> I think it would be interesting to have the 9 different "drawbars" on
>>>>>> separate outputs so each harmonic could be processed separately and a mixed
>>>>>> output for the slightly more traditional sound. Throw in a MIDI input to
>>>>>> simplify controlling the thing. Trigger and Gate outputs. Maybe something
>>>>>> to even select the harmonics that get switched to the outputs (more fifths,
>>>>>> higher/lower octaves). CV inputs to automate the "drawbars" that go to the
>>>>>> mixed output. Some sort of randomizing option would be cool too.
>>>>>>
>>>>>> As always, thoughts and criticisms welcome.
>>>>>> _______________________________________________
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>>>>>>
>>>>>>
>>>>>>
>>>>>
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>>>>
>>>
>>>
>>> --
>>> Quincas Moreira
>>> Test Pilot at VBrazil Modular
>>>
>>
>>
>
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