[sdiy] How to get any TET from your Deepmind12

Ian Fritz ijfritz at comcast.net
Wed Feb 19 13:58:21 CET 2020


With an analog VCO you can get any ET in seconds just by scaling and translating the input CV. For my alternate tuning I usually like the "88 CET", which doesn't even have octaves. It can be heard on some of my audio and youtube demos.

Ian



> On Feb 18, 2020, at 5:29 PM, ColinMuirDorward <colindorward at gmail.com> wrote:
> 
> Ha, well put, Chris.
> Yes, like Adam said, it's simply the number of notes in an octave, spread in equal increments. aka EDO (equal division of the octave)
> It's nice to switch that up and try some other tunings. A bit like tasting different cuisines. There are a lot of notes to choose from!
> Colin
> 
>> On Tue, Feb 18, 2020 at 10:26 PM Adam Inglis (sdiy) <synthdiy at adambaby.com> wrote:
>> 12 tone equal temperament is the traditional (thanks JS Bach) division of the octave.
>> 
>>> On 19 Feb 2020, at 1:19 pm, Chris McDowell <declareupdate at gmail.com> wrote:
>>> 
>>> What is blazes is TET?!
>>> 
>>> 
>>> 
>>>> On Feb 18, 2020, at 5:11 PM, ColinMuirDorward <colindorward at gmail.com> wrote:
>>>> 
>>>> I just posted this on one of the forums, but perhaps someone here might find it useful as well.
>>>> 
>>>> I'm sure lots of folks have figured it out already, but it wasn't till two years after buying a DM12 that I realised you could get pretty much any equal division of the octave tuning out of it. Here's how: 
>>>> 
>>>> You'll need two modulation slots. NoteNum->PitchCoarse and NoteNum->PitchFine.
>>>> 
>>>> To solve for the coarse amount use (1536-128(TET))/TET
>>>> 
>>>> You'll probably get something like -54.8571 (this is for 21TET).
>>>> (BTW, it's negative because we need to reduce the key scaling down from the hardwired 12TET amount. If you plugged in for 10TET, you'd get a positive value.)
>>>> 
>>>> So, round that to -55 and plug it into your coarse amount. Now we get out our FineTune to trim the error away. 
>>>> 
>>>> Multiply the difference by 256. So that's 256*0.142857... giving us 36.5714. Round that to 37 and enter that into the NotNum->fine tune  amount.
>>>> Note that this is a positive modulation amount because we rounded our coarse down to 55, which made the spread a wee bit more than 21tet.
>>>> Also you can just trim the fine amount by ear.
>>>> 
>>>> Done!
>>>> 
>>>> I believe this works for any TET up to 1536TET. 
>>>> 
>>>> 
>>>> -- 
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>>>> -
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> 
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