true mono?

[philxm]

A lot of the work I do in Amadeus is digitizing old 45s. When digitizing
mono vinyl I prefer to use both channels, partly because this gives me more
options during the cleanup phase (e.g., it allows me to copy a good spot on
one channel and simply paste it over a blemished spot in the corresponding
area of the other channel), and also because I find that "dual-channel mono"
has more sonic depth (due to the slight wear distinctions between L and R)
than single-channel mono.

There are occasions, however, when I can't be entirely sure if a record is
in true mono, or is rather a stereo mix with a very narrow pan range. My
question, then, is whether there are any analysis tools in Amadeus that can
help me determine whether a record is dual-channel mono, or true stereo.

Thanks very much,
--Phil M.


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[Sonic Purity]

There are occasions, however, when I can't be entirely sure if a record is in true mono, or is rather a stereo mix with a very narrow pan range. My question, then, is whether there are any analysis tools in Amadeus that can help me determine whether a record is dual-channel mono, or true stereo.

I am not aware of any specific tools. Here is what i do:

1) Make a copy of the 2-channel file.
2) Adjust the level so that the channels match levels exactly (i usually do this in Amadeus II... not even sure if Pro has the statistics back yet... have not looked).
3) Invert polarity of one of the two channels.
4) Sum the two channels to mono.
5) Look and listen to the result, which tends to make the situation obvious.

Actually, i usually pre-judge with my knowledge of what that record label was doing in the year the 45 was released.

[Lou Kash]

A stereograph or a correlation meter would be the right tools for that. (Maybe it's time for a feature request... :)

[MrEes]

http://www.fluxhome.com/products/Freewares/stereotool

--
Michael Rees
Composer &c. <http://soundsgrate.net>

some things are best learned
head-first and others body-
first

On Jan 26, 2009, at 3:57 pm, Lou Kash wrote:

A stereograph or a correlation meter would be the right tools for
that.

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[Lou Kash]

http://www.fluxhome.com/products/Freewares/stereotool

Yes, I forgot about that one... It does exactly what's needed. After installation you'll find it under Effects > Audio Units > Flux > STTool.

But since Amadeus doesn't have any "insert" slots, to use it you have to open the plugin and check your file or the selection by clicking the Preview button. Do NOT Apply! Since the AU window is not modal, you can also switch back and forth and change your selection to check different portions of the track. Make sure that you always select both channels, as selecting only one channel doesn't make any sense.

(Tip: if you ever feel the urge to process your vinyl recordings through this plugin while moving its Width slider far to the right, be brave and strong and don't... ;)