Pro Tools levels - what's going on?

[Adrian Tuddenham[_2_]]

I needed to to make slight adjustments to the speed and pitch of a
badly-recorded acoustic '78' (which was actually wavering from 80 to
about 85 rpm), so I imported the 16-bit mono file into Pro-Tools 5.01 to
use the pitch-changing plug-ins.

The original file had about 2db headroom, but when I Bounced it back, it
was over-modulated and had horrible clipping.

As a check, I recorded a 1Kc/s tone at 10dB below peak, imported it into
a 16-bit Pro-Tools session and then Bounced it straight back again
without altering it in any way. The result was 3.56 dB louder.

What is going on?


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

[Mark]

On Nov 10, 6:06*am, (Adrian
Tuddenham) wrote:
> I needed to to make slight adjustments to the speed and pitch of a
> badly-recorded acoustic '78' (which was actually wavering from 80 to
> about 85 rpm), so I imported the 16-bit mono file into Pro-Tools 5.01 to
> use the pitch-changing plug-ins.
>
> The original file had about 2db headroom, but when I Bounced it back, it
> was over-modulated and had horrible clipping.
>
> As a check, I recorded a 1Kc/s tone at 10dB below peak, imported it into
> a 16-bit Pro-Tools session and then Bounced it straight back again
> without altering it in any way. *The result was 3.56 dB louder.
>
> What is going on?
>
> --
> ~ Adrian Tuddenham ~
> (Remove the ".invalid"s and add ".co.uk" to reply)www.poppyrecords.co.uk

something to do with mono vs stero .wav files maybe?

Mark

[Adrian Tuddenham[_2_]]

Mark > wrote:

> On Nov 10, 6:06*am, (Adrian
> Tuddenham) wrote:
> > I needed to to make slight adjustments to the speed and pitch of a
> > badly-recorded acoustic '78' (which was actually wavering from 80 to
> > about 85 rpm), so I imported the 16-bit mono file into Pro-Tools 5.01 to
> > use the pitch-changing plug-ins.
> >
> > The original file had about 2db headroom, but when I Bounced it back, it
> > was over-modulated and had horrible clipping.
> >
> > As a check, I recorded a 1Kc/s tone at 10dB below peak, imported it into
> > a 16-bit Pro-Tools session and then Bounced it straight back again
> > without altering it in any way. *The result was 3.56 dB louder.
> >
> > What is going on?
> >
> > --
> > ~ Adrian Tuddenham ~
> > (Remove the ".invalid"s and add ".co.uk" to reply)www.poppyrecords.co.uk
>
> something to do with mono vs stero .wav files maybe?

It was a single mono AIFF track and I exported it in mono..

I had previously suspected that something like this was happening a long
while ago, but then I was using multiple tracks so I assumed it was due
to the tracks adding. This time there were no other tracks and I made
no changes to the single track at all, it should have come back out
bit-for-bit accurate.

--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk