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Old 12-08-2013, 02:37 PM   #18 (permalink)
Sonixs
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I picked up this thread via the bavarianDemon forum and have been chewing on it for a while trying to find the hidden "magic". Thanks ArchmageAU for taking the time to unravel the mystery!

After a few hours of grinding away at your numbers using MS Excel I've a few comments/corrections and would value your input. Perhaps it'll help others understand this too.

Using a formula (will give it later in the post) and running your numbers I totally agree with the following, save for a few decimals which have been left out of your final results ...
Quote:
Originally Posted by ArchmageAU View Post
Consider the mix (high)50, (low)-10, (offset)0.
For inputs:
-100,-90,-80,-70,-60,-50,-40,-30,-20,-10,0,10,20,30,40,50,60,70,80,90,100
The output ADJUSTMENTS are:
-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,5,10,15,20,25,30,35,40,45,50

If we change the mix to: (high)50, (low)-10, (offset)50

The output ADJUSTMENTS are:
-15,-14,-13,-12,-11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,5,10,15,20,25

Therefore, for the master mix for the BD3SX (Ax3 > Ax2 (high)0% (low)-125% (offeset)100%):

If Aux3 was on the knob so it can vary from -100 to +100.

For input values:
-100,-90,-80,-70,-60,-50,-40,-30,-20,-10,0,10,20,30,40,50,60,70,80,90,100
The working adjusted values are:
-200,-190,-180,-170,-160,-150,-140,-130,-120,-110,-100,-90,-80,-70,-60,-50,-40,-30,-20,-10,0

Therefore the Mix adjustments to be added to Aux2 are:
-250,-237,-225,-212,-200,-187,-175,-162,-150,-137,-125,-112,-100,-87,-75,-62,-50,-37,-25,-12,0
What I disagree with, using the formula that calculates the previous quoted numbers perfectly, is the following...
Quote:
Originally Posted by ArchmageAU View Post
If you have the mix (high)+25 (low)+50 (offset)+38.
You have an input of +18
You have an output of +25
What is the actual output?

30 !!!!

Input of +18 (less offset of 38) is -20
-20 being less than 0 uses the low adjustment
-100/-20 = 0.2 (1/5)
Therefore 0.2 * +25 = 5. So the adjustment is +5.

25 +5 = 30!!
I calculate the OUTPUT adjustment as 10, with a total output value of 35.

Working with the following
Master Channel: Max 100%, Min -100%
Mix: High 25% Low 50% Offset 38%
Master Input 18%
Slave Output 25%

Step 1 - Calculate INPUT - OFFSET = 18 - 38 = -20 (Same as your calculation)
Step 2 - Calculate ratio of INPUT - OFFSET based on Master Channel Min = -20/-100 = 0.2 (Same as your calculation, save for a typo where you had = -100/-20 which is 5
I used the Master Channel Min since the INPUT - OFFSET is less than 0; as per your "...-20 being less than 0 uses the low adjustment..."
Step 3 - Calculate OUTPUT ADJUSTMENT for Slave Channel = 0.2 * 50 = 10
I used the Mix Low since the INPUT - OFFSET is less than 0; as per your "...-20 being less than 0 uses the low adjustment..."
Step 4 - Calculate Slave Channel Total Output = 25 + 10 = 35

Are my calculations correct?
Have I discovered the hidden "magic"?
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