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Multiband Ratio 7.23
https://forums.stereotool.com/viewtopic.php?f=15&t=4868		 Page 1 of 1
Author:  bob53bob [ Fri Jul 05, 2013 12:38 am ]
Post subject:  Multiband Ratio 7.23
Expert>Processing>Multiband>Speeds>Ratio (all 6 bands) = 1000. All Attack Times = 9.14, All Release Times = 51,000, All Release Hold Times = 1.05.

Under these conditions (release so slow that the audio should not get denser solely because of added drive), I would expect that increasing the Multiband Drive by 20db would result in no added drive to the clipper & no audible change in level or density. I am seeing a substantial increase in level past the Multiband stage when boosting the drive. The result is the same with RMS or Peak detection. Could anyone confirm that the ratio of the Multiband stage seems to be far less than 1000:1?
Author:  hvz [ Fri Jul 05, 2013 1:10 am ]
Post subject:  Re: Multiband Ratio 7.23
Are you using feedback mode? In feedforward mode there should be no volume difference. However in feedback mode (which sounds better) the measured *output* level is used to control the level. Which means that as soon as the level has been dropped a bit, the measured level is also lower and at some point there's a balance.

In feedforward mode, the level is adjusted based on the input level, which isn't affected by what the compressor does.
Author:  hvz [ Fri Jul 05, 2013 1:12 am ]
Post subject:  Re: Multiband Ratio 7.23
To clarify:

Say, audio is at 0 dB, threshold is at -6 dB.

In feedforward mode (assuming infinite ratio) the level would be reduced by 6 dB.

In feedback mode, by the time the level is reduced by 3 dB, the adjustment that is calculated by the compressor is also -3 dB, hence the level will be dropped by 3 dB and not further.
Author:  bob53bob [ Fri Jul 05, 2013 2:34 am ]
Post subject:  Re: Multiband Ratio 7.23
Quote:
Are you using feedback mode? In feedforward mode there should be no volume difference. However in feedback mode (which sounds better) the measured *output* level is used to control the level. Which means that as soon as the level has been dropped a bit, the measured level is also lower and at some point there's a balance.

In feedforward mode, the level is adjusted based on the input level, which isn't affected by what the compressor does.
I don't see a feedback / feed forward mode selector, however I see a Feedback 0-100% slider on each band. It is at 100% on each band.
Author:  Bojcha [ Fri Jul 05, 2013 4:10 am ]
Post subject:  Re: Multiband Ratio 7.23
Yea it's slider. 0% is FF and 100% is FB. However even at 90% you are actually half way to FF ;)
Author:  bob53bob [ Fri Jul 05, 2013 4:39 am ]
Post subject:  Re: Multiband Ratio 7.23
Quote:
Yea it's slider. 0% is FF and 100% is FB. However even at 90% you are actually half way to FF ;)
Thanks Bojcha.....another tool to play with and enjoy :)
Author:  Brian [ Fri Jul 05, 2013 9:00 am ]
Post subject:  Re: Multiband Ratio 7.23
Quote:
Yea it's slider. 0% is FF and 100% is FB. However even at 90% you are actually half way to FF ;)
Image
Author:  bob53bob [ Sat Jul 06, 2013 1:34 pm ]
Post subject:  Re: Multiband Ratio 7.23
Quote:
To clarify:

Say, audio is at 0 dB, threshold is at -6 dB.

In feedforward mode (assuming infinite ratio) the level would be reduced by 6 dB.

In feedback mode, by the time the level is reduced by 3 dB, the adjustment that is calculated by the compressor is also -3 dB, hence the level will be dropped by 3 dB and not further.
So in feedback mode, the greater the -threshold is, the closer it will get to 1000:1? I really don't need 1000:1 but would like at least 20:1 in reality. How do I get there in Feedback mode?

Agreed...Feed Forward mode doesn't sound nearly as good--at least with the brief run I tried with it. It had some breaking up sounds even though the CPU load didn't appear to change.
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