Re: [SoX-users] vol effect inverts phase acc. to man pages - how to revert that back?

[Klaus S. <kls...@go...>]

On Wed, Apr 14, 2010 at 5:44 PM, Pavel Hofman <pav...@iv...>wrote:

> Klaus Schulz napsal(a):
> > Hi folks.
> >
> > I just read by coincidence in the man-pages that vol reverts phase !?!?
> > Can anybody confirm that?
> >
> > How do I revert that back to original?
> >
> > Or shall I better use "gain" instead? It doesn't say in the man pages
> > that the phase is changed with "gain".
> >
>
> The gain effect takes its ratio parameter in dB, i.e. a negative number
> means attenuation.
>
> The vol effect takes its ratio parameter without any other specifier as
> a linear ratio. If it is a negative number, it reverts the phase. Just
> the expected behaviour, as described in the man page:
>



vol also works in db.  Have a look at the man pages. Does this mean vol will
change phase on linear and it won't on db according to your above logic.

Then the man page needs to be updated. It is pretty confusing. It took me a
while to realize this behavior at all.



>
> a negative gain inverts the audio signal in  addition to adjusting its
> volume.
>
> Regards,
>
> Pavel.
>
>
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