TIP: Controlling one parameter using another

[DarkStar]

Several forum posters, and I, would like to be able to control one parameter using another. For example, in an EQ, increase the Q (narrow the scope) as the Gain moves away from 0 dB. The current solution is to make them both targets of a Multiparameter, then use the MP to control them both. In the attached Reaper project, I have implemented this for Band 4 in MEqualizer (MP1 "G4-Q4"). The drawback is that I need to use MP1 to change the values rather than just drag the band's Gain parameter or node.

Now, have a look at Band 3. I can drag the node or Gain parameter up / down and the Q value changes too. I have implemented this using Parameter Modulation in Reaper.
-- In MEqualizer, MP2 ("Q3 (via R)") is set to control Band 3's Q value,
-- In Reaper, the Q3 (via R) parameter is controlled (using Parameter Modulation) by Band 3's Gain parameter,
-- I need to go via an MP as I need a V-shaped Transformation curve for the Q value.



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This is for Reaper. Other DAWs may have a similar mechanism. If so, please post details of the method below.

[al808]

Hi DarkStar,
If it's of any interest to anybody,for those not using Reaper (Logic user here), this is easily done using Plogue Bidule as a wrapper. Same goes for some of SplitEQ's functionality, combining 2 MAutoDynamicEq's into MDynamicSplitEq .

[magmagwa]

Both look great. Tell more of this "2 MAutoDynamic to get SplitEQ" you speak of ?

[magmagwa]

DS, this is amazing, I'm still trying to get my head around it. Thanks for the RPP! I'm going through it now. On first blush it looks like reaper has equivalent routing to plogue. However Plogues looks better as you are wiring things up without doing the reaper split/join processing for multiple audio routes.