Use logarithmic adjustment for the gain in the autowah effect

1 files changed, 7 insertions, 7 deletions

diff --git a/Alc/effects/autowah.c b/Alc/effects/autowah.c
index 9857c722..c8317c8b 100644
--- a/Alc/effects/autowah.c
+++ b/Alc/effects/autowah.c
@@ -71,8 +71,8 @@ static ALvoid ALautowahState_update(ALautowahState *state, ALCdevice *device, co
     attackTime = slot->EffectProps.Autowah.AttackTime * state->Frequency;
     releaseTime = slot->EffectProps.Autowah.ReleaseTime * state->Frequency;
 
-    state->AttackRate = 1.0f / attackTime;
-    state->ReleaseRate = 1.0f / releaseTime;
+    state->AttackRate = powf(1.0f/GAIN_SILENCE_THRESHOLD, 1.0f/attackTime);
+    state->ReleaseRate = powf(GAIN_SILENCE_THRESHOLD/1.0f, 1.0f/releaseTime);
     state->PeakGain = slot->EffectProps.Autowah.PeakGain;
     state->Resonance = slot->EffectProps.Autowah.Resonance;
 
@@ -102,9 +102,9 @@ static ALvoid ALautowahState_process(ALautowahState *state, ALuint SamplesToDo,
              * incoming signal, and attack or release to reach it. */
             amplitude = fabsf(smp);
             if(amplitude > gain)
-                gain = minf(gain+state->AttackRate, amplitude);
+                gain = minf(gain*state->AttackRate, amplitude);
             else if(amplitude < gain)
-                gain = maxf(gain-state->ReleaseRate, amplitude);
+                gain = maxf(gain*state->ReleaseRate, amplitude);
             gain = maxf(gain, GAIN_SILENCE_THRESHOLD);
 
             /* FIXME: What range does the filter cover? */
@@ -168,9 +168,9 @@ static ALeffectState *ALautowahStateFactory_create(ALautowahStateFactory *UNUSED
     if(!state) return NULL;
     SET_VTABLE2(ALautowahState, ALeffectState, state);
 
-    state->AttackRate = 0.0f;
-    state->ReleaseRate = 0.0f;
-    state->Resonance = 0.0f;
+    state->AttackRate = 1.0f;
+    state->ReleaseRate = 1.0f;
+    state->Resonance = 2.0f;
     state->PeakGain = 1.0f;
     state->GainCtrl = 1.0f;