dB-based (-70. dB to 6. dB) gain control without GUI?

MaxMSPbeginner
Masa's icon

Masa

Hi, I am using live.gain~ to adjust the loudness of audio signal with dB.
Has anyone implemented the dB functionality (silence, -70. dB to 6. dB) of live.gain~ without GUI?
Perhaps the combination of 'scale -70. 6. 0. 157.' and 'gain~' is the simplest solution...?
I am optimising my patch.

Thanks a lot,
Masa

geoscle's icon

geoscle

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Stephane Morisse's icon

Stephane Morisse

As far as I know, the above solution, even if it is correct, won't reflect the values output by live.gain. I had a very hard time trying to get this using expressions or that kind of stuff and never got a clear answer by Ableton about their scaling, even for internal live mixer. The closer solution used an array of values. I'm going to try to find it...

Christopher Dobrian's icon

Christopher Dobrian

I think it's something more like this. (I.e., if gain value is less than -70 dB, set gain to 0.)

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Masa's icon

Masa

Hi, thank you very much Franz, Stephane and Christopher for your smart input.
OK, then I will replace all my live.gain~s with Christopher's approach and see if it reduces CPU usage.

Masa's icon

Masa

I modified Christopher's patch, as live.gain~ mutes the signal when equals to -70.

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Masa's icon

Masa

As Stephane noted, when trying fading out with gain value, live.gain~ sounds smoother than my patch above. I am not sure why.