Re: [SoX-users] how to adjust synth mix gain level?

[Jan S. <ha...@st...>]

On Jul 14 16:41:32, for...@gm... wrote:
> I have a feeling this will involve multiple invocations of sox using a |,
> but am not sure yet.
> 
> I want to be able to mix synth output with a pre-existing wav file. I could
> do this as follows:
> 
>   play orig.wav trim 0 3 synth 0 brownnoise mix
> 
> Which appears to equally mix the noise with the original. However, I want
> much less noise signal than that, only a hint of it. I can apply gain after
> the synth, but that applies to the entire chain. How can I know the gain of
> the noise down a lot but let the original come through much louder?

You can also put it in a separate file:

  sox -n noise.wav synth 3 brownnoise gain -9
  sox -m orig.wav noise.wav mix.wav