[sdiy] MS-20 tempco (was Model D service)

[Roman Sowa]

Not a downside I'd say. Adding more octaves is just a matter of divider 
in power-of-2 ratios. It's no problem today to make 5-octave keyboard in 
Hz/V scale, and who would want more keys. The rest is done with octave 
switches.

It's like discussing what is better: linear of exponentional FM. Each 
has their uses. IMHO the old Korg's approach to the subject is the best 
- note pitch in Hz/V, the rest in oct/V

Roman

W dniu 2017-05-09 o 09:37, Tony Kalomiris pisze:
> Yes excellent description Roman, thanks.
>
> Only downside was this was limited to 3 1/2 (0 ~ 8.4 V) or 4 octaves
> (MaxiKorg) , as opposed to ten octaves of exponential input. (VCO
> 1+2)
>
> On 2017-05-09, at 3:20 AM, Roman Sowa wrote:
>
>> The expo pair in MS20 is used only for modulation and external
>> V/oct sources, while keyboard pitch is provided as linear voltage
>> (Hz/V) derived from stable source. So without any modulation, at
>> ballanced state of the pair, when there's 0V between bases, the VCO
>> core current is not dependent on those transistors and their
>> temperature effects.
>>
>> That's one of the beauties of Hz/V systems, it's so easy to make
>> the pitch stable.
>>
>> Roman
>>
>
>
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