[ardour-users] delta 44

Ross Vandegrift ross at lug.udel.edu
Sat Jan 7 08:39:14 PST 2006

On Sun, Jan 08, 2006 at 01:33:35AM +1100, nicholas manojlovic wrote:
> whats the deal with the 'analog volume' tab in envy? what is dac, adc, ipga?

This is confusing - especially since it only seems to be present in
the Delta44 and 66 cards.  The analog volume sliders control the gain
level of the converters.  If you load the card in Windows, there is
aparantly a switch somewhere that lets you switch levels from -10 to
+4.  In reality, the card has the capability to control this

DAC: This will control output gain.
ADC: These are useless.
IPGA: These control the input levels for the analog channels.  Any
change to then sets the ADC channels to MAX.

> instrument to mixer
> insert of mixer to delta break out
> delta outs 1 and 2 to stereo in on mixer.
> im trying to get my head around a better way to do it but keep getting 
> stuck in a rut - has anyone got any ideas?

I forget what IPGA levels correspond to what typical levels, because
I actually abuse them and use them as gain control (heh, card sounds
clean, why not!).

But you could adjust them until you found comfortable levels and
monitor via your computer.  That's sort of the only readily aparant
change I might make, since you probably want the mixer for more than
four channels.

FWIW, I think IPGA stands for "InPut Gain Array".  But I might've made
that up.

Ross Vandegrift
ross at lug.udel.edu

"The good Christian should beware of mathematicians, and all those who
make empty prophecies. The danger already exists that the mathematicians
have made a covenant with the devil to darken the spirit and to confine
man in the bonds of Hell."
	--St. Augustine, De Genesi ad Litteram, Book II, xviii, 37

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