PeakController: initial work on attack- and decay-support

The decay knob didn't actually do anything before. Now it's useful
together with newly introduced attack knob. One can do much better
sidechaining now without disturbing artifacts due to too responsive
volume changes.
(cherry picked from commit 9615ceabd5)

plugins/peak_controller_effect/peak_controller_effect_controls.cpp

@@ -1,7 +1,8 @@
 /*
- * peak_controller_effect_controls.cpp - controls for PeakController effect
+ * peak_controller_effect_controls.cpp - controls for peakController effect
  *
  * Copyright (c) 2008 Paul Giblock <drfaygo/at/gmail/dot/com>
+ * Copyright (c) 2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
  * 
  * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
  *
@@ -36,8 +37,9 @@ PeakControllerEffectControls( PeakControllerEffect * _eff ) :
 	m_effect( _eff ),
 	m_baseModel( 0.5, 0.0, 1.0, 0.001, this, tr( "Base value" ) ),
 	m_amountModel( 1.0, -1.0, 1.0, 0.005, this, tr( "Modulation amount" ) ),
-	m_decayModel( 0.1, 0.01, 5.0, 0.0001, this, tr( "Release decay" ) ),
-	m_muteModel( FALSE, this, tr( "Mute output" ) )
+	m_attackModel( 0, 0, 0.999, 0.001, this, tr( "Attack" ) ),
+	m_decayModel( 0, 0, 0.999, 0.001, this, tr( "Release" ) ),
+	m_muteModel( false, this, tr( "Mute output" ) )
 {
 }