Re: gain-mapping - was Re: OSC next

On Sat, 14 May 2016, Robin Gareus wrote:

> On 05/14/2016 04:41 PM, Len Ovens wrote:
>>
>> The other method of doing the same thing, is to continue to use the
>> internal fader math and add an offset of -0.006990539841353893 to the
>> 1024 value. This would make 800 = 0dB and full scale just slightly less
>> than +6.
>
> good point. How did you compute that number?

I didn't... Ardour did. 800 in let Ardour do the math gives 
0.006990539841353893 dB out. Ah, I should be using gain not dB :)
(time for surface three in abs gain)

> over here
>
>  1.0 - (2 ^ ((198 * (800/1023) ^ (1/8) - 192) / 6))
> = -0.000805030

That is probably correct for gain. In the end I need a gain offset not dB. 
(The value that Ardour needs is gain 0->2.)

--
Len Ovens
www.ovenwerks.net