redesign VCA control over gain (and theoretically other scalar controls)

master(s) value now just scales the control's own value; a trivial
bit of math at assign/deassign ensures that values do not change
during add/remove master operations

1 files changed, 0 insertions, 47 deletions

diff --git a/libs/ardour/gain_control.cc b/libs/ardour/gain_control.cc
index 21e1ba5f85..e6154495a4 100644
--- a/libs/ardour/gain_control.cc
+++ b/libs/ardour/gain_control.cc
@@ -100,50 +100,3 @@ GainControl::inc_gain (gain_t factor)
 	}
 }
 
-void
-GainControl::recompute_masters_ratios (double val)
-{
-	/* Master WRITE lock must be held */
-
-	/* V' is the new gain value for this
-
-	   Mv(n) is the return value of ::get_value() for the n-th master
-	   Mr(n) is the return value of ::ratio() for the n-th master record
-
-	   the slave should return V' on the next call to ::get_value().
-
-	   but the value is determined by the masters, so we know:
-
-	   V' = (Mv(1) * Mr(1)) * (Mv(2) * Mr(2)) * ... * (Mv(n) * Mr(n))
-
-	   hence:
-
-	   Mr(1) * Mr(2) * ... * (Mr(n) = V' / (Mv(1) * Mv(2) * ... * Mv(n))
-
-	   if we make all ratios equal (i.e. each master contributes the same
-	   fraction of its own gain level to make the final slave gain), then we
-	   have:
-
-	   pow (Mr(n), n) = V' / (Mv(1) * Mv(2) * ... * Mv(n))
-
-	   which gives
-
-	   Mr(n) = pow ((V' / (Mv(1) * Mv(2) * ... * Mv(n))), 1/n)
-
-	   Mr(n) is the new ratio number for the slaves
-	*/
-
-	const double nmasters = _masters.size();
-	double masters_total_gain_coefficient = 1.0;
-
-	for (Masters::iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
-		masters_total_gain_coefficient *= mr->second.master()->get_value();
-	}
-
-	const double new_universal_ratio = pow ((val / masters_total_gain_coefficient), (1.0/nmasters));
-
-	for (Masters::iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
-		mr->second.reset_ratio (new_universal_ratio);
-	}
-}
-