Do some simple tests for me?

Lex Nahumury · Apr 13, 2006, 12:58 AM

Quote:

Originally Posted by Russ

The sliders are located after the inputs in the DSP (or plugin). They do not mute the hardware inputs themselves, rather they mute the plugin's output (i.e. they modify one of the pathways for the signal, within the DSP (or plugin)). If you include the same hardware inputs within another plugin, than you have a seperate pathway for that signal (i.e. ProFX:ADC is not effected by either the 'AC97 In' slider, nor the 'AC97 Rec Level' slider. It creates it own pathway for the signal within the DSP).

Very well explained Russ,
and that is exactly one of the things why I don't like kxmixer+epilog/prolog!
Sure, I understand the design considerations, but it makes kX verryyy confusing!
(like it isn't complex enough as it is)
Can't expect users to understand all this 'back&forth' nonsense.

Lex Nahumury · Apr 13, 2006, 12:59 AM

Russ,

Well, It's a 'long shot' but have a look at
the mentioned high pass filter;

ADC high pass filter active (78h)
high pass filter offset (6Ah)

A High Pass filter acts as a DC blocker so who knows.
However, the datasheet is unclear about it's purpose.
Like I said; it's a 'long shot'.

/Lex

Russ · Apr 13, 2006, 01:11 AM

I agree, and that part seems to add unnecessary (imho) confusion.
Why hide those inputs inside of epilog? (as well as the fact that xrouting sends the AC97 signal (from prolog in the default DSP) to StereoL/StereoR, and not to the recording outputs, which seems illogical (at first anyway)).

In any case, ProFX simplifies things greatly, and I highly recommend using them. I only offer alternative setups (using prolog/epilog) to try and help explain how the DSP works (particulairly the default DSP).

Russ · Apr 13, 2006, 01:14 AM

Quote:

Originally Posted by Lex Nahumury

Russ,

Well, It's a 'long shot' but have a look at
the mentioned high pass filter;

ADC high pass filter active (78h)
high pass filter offset (6Ah)

A High Pass filter acts as a DC blocker so who knows.
However, the datasheet is unclear about it's purpose.
Like I said; it's a 'long shot'.

/Lex

Ok, I will do some testing with those registers and see if it makes a difference.
Thanks for taking a looking at the datasheet. I never would have considered those registers as a possible cause, so if you see anything else, let me know.

Russ · Apr 13, 2006, 04:09 AM

No luck with the long shot.
In any case, it is a not a major issue for me. I have several workarounds available.
There are some other (unrelated) things with the codec I have been meaning to test as well, and maybe I will find something while doing that.

drgrozozo · Apr 13, 2006, 11:34 AM

Quote:

Originally Posted by Russ

The sliders are located after the inputs in the DSP (or plugin). They do not mute the hardware inputs themselves, rather they mute the plugin's output (i.e. they modify one of the pathways for the signal (or modify the signal itself at that point only), within the DSP (or plugin)). If you include the same hardware inputs within another plugin, than you have a seperate pathway for that signal (i.e. ProFX:ADC is not effected by either the 'AC97 In' slider, or the 'AC97 Rec Level' slider. It creates it's own pathway for the signal within the DSP).

thanks for the explanation, it's much clearer for me now

Lex Nahumury · Apr 13, 2006, 01:17 PM

Quote:

Originally Posted by Russ

No luck with the long shot.
In any case, it is a not a major issue for me. I have several workarounds available.
There are some other (unrelated) things with the codec I have been meaning to test as well, and maybe I will find something while doing that.

Ok.
As for workarounds, besides a 'hard mute' in microcode
you could put a simple high pass filter right after the AC97 inputs to kill any DC.

I do this by default to remove unwanted low freq content coming from guitar, vocals etc. during recording. DC is killed automaticly.

Btw; iirc, there is a user in general section who has the same card as you do.
Perhaps you could contact him to see if his card acts the same.
http://www.hardwareheaven.com/general-discussion/103586-cubase-nightmare-help.html

Russ · Apr 13, 2006, 10:57 PM

Thanks for the tips.

If it was adding DC to my AC97 signal, than it would be a bigger problem, but, as it only does it if I mute the Gain (which means I am generally not using it at that time anyway), muting the plugin itself is ok.

As for that user, there is no guarentee that it is a similair card. Unfortunatley there are several different models in the sb022x series (different codecs, and different hardware), but maybe I will try and locate a good candidate (people who used my T22X58O plugin) and see if they will test it.

Apr 13, 2006, 01:11 AM	Thread Starter #33
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,561 Rep Power: 62	I agree, and that part seems to add unnecessary (imho) confusion. Why hide those inputs inside of epilog? (as well as the fact that xrouting sends the AC97 signal (from prolog in the default DSP) to StereoL/StereoR, and not to the recording outputs, which seems illogical (at first anyway)). In any case, ProFX simplifies things greatly, and I highly recommend using them. I only offer alternative setups (using prolog/epilog) to try and help explain how the DSP works (particulairly the default DSP). Last edited by Russ; Apr 13, 2006 at 01:25 AM.

Apr 13, 2006, 12:59 AM	#32
Lex Nahumury DH Senior Member Join Date: Jan 2003 Location: The Netherlands Posts: 1,932 Rep Power: 64	Russ, Well, It's a 'long shot' but have a look at the mentioned high pass filter; ADC high pass filter active (78h) high pass filter offset (6Ah) A High Pass filter acts as a DC blocker so who knows. However, the datasheet is unclear about it's purpose. Like I said; it's a 'long shot'. /Lex

Apr 13, 2006, 04:09 AM	Thread Starter #35
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,561 Rep Power: 62	No luck with the long shot. In any case, it is a not a major issue for me. I have several workarounds available. There are some other (unrelated) things with the codec I have been meaning to test as well, and maybe I will find something while doing that.

Apr 13, 2006, 10:57 PM	Thread Starter #38
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 5,561 Rep Power: 62	Thanks for the tips. If it was adding DC to my AC97 signal, than it would be a bigger problem, but, as it only does it if I mute the Gain (which means I am generally not using it at that time anyway), muting the plugin itself is ok. As for that user, there is no guarentee that it is a similair card. Unfortunatley there are several different models in the sb022x series (different codecs, and different hardware), but maybe I will try and locate a good candidate (people who used my T22X58O plugin) and see if they will test it.