From 4c0a7f6dfd6fa1b922e7788912ad3b315ef2e93c Mon Sep 17 00:00:00 2001
From: Jean Pierre Cimalando <jp-dev@inbox.ru>
Date: Tue, 18 Aug 2020 18:15:20 +0200
Subject: [PATCH 1/2] Adjust the ADSR exponential rate

---
 src/sfizz/ADSREnvelope.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sfizz/ADSREnvelope.cpp b/src/sfizz/ADSREnvelope.cpp
index bfd7f3f8..472c9fd7 100644
--- a/src/sfizz/ADSREnvelope.cpp
+++ b/src/sfizz/ADSREnvelope.cpp
@@ -28,7 +28,7 @@ template<class Type>
 Type ADSREnvelope<Type>::secondsToExpRate (Type timeInSeconds) const noexcept
 {
     timeInSeconds = std::max<Type>(25e-3, timeInSeconds);
-    return std::exp(-8.0 / (timeInSeconds * sampleRate));
+    return std::exp(-9.0 / (timeInSeconds * sampleRate));
 };
 
 template <class Type>

From 12e2c95f5ce161dd868c4d5463273e922cad53b1 Mon Sep 17 00:00:00 2001
From: Jean Pierre Cimalando <jp-dev@inbox.ru>
Date: Tue, 18 Aug 2020 19:43:36 +0200
Subject: [PATCH 2/2] Set the threshold of ADSR release to -80 dB

---
 src/sfizz/ADSREnvelope.cpp | 6 +++---
 src/sfizz/Config.h         | 5 +++++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/sfizz/ADSREnvelope.cpp b/src/sfizz/ADSREnvelope.cpp
index 472c9fd7..b17bce09 100644
--- a/src/sfizz/ADSREnvelope.cpp
+++ b/src/sfizz/ADSREnvelope.cpp
@@ -96,7 +96,7 @@ Type ADSREnvelope<Type>::getNextValue() noexcept
         return currentValue;
     case State::Release:
         currentValue *= releaseRate;
-        if (currentValue > config::virtuallyZero)
+        if (currentValue > config::egReleaseThreshold)
             return currentValue;
 
         currentState = State::Done;
@@ -169,9 +169,9 @@ void ADSREnvelope<Type>::getBlock(absl::Span<Type> output) noexcept
             sfz::fill(output.first(count), currentValue);
             break;
         case State::Release:
-            while (count < size && (currentValue *= releaseRate) > config::virtuallyZero)
+            while (count < size && (currentValue *= releaseRate) > config::egReleaseThreshold)
                 output[count++] = currentValue;
-            if (currentValue <= config::virtuallyZero) {
+            if (currentValue <= config::egReleaseThreshold) {
                 currentValue = 0;
                 currentState = State::Done;
             }
diff --git a/src/sfizz/Config.h b/src/sfizz/Config.h
index 3ec5f1a8..c13707ef 100644
--- a/src/sfizz/Config.h
+++ b/src/sfizz/Config.h
@@ -86,6 +86,11 @@ namespace config {
        modulated filter. The lower, the more CPU resources are consumed.
     */
     constexpr int filterControlInterval { 16 };
+    /**
+       Amplitude below which an exponential releasing envelope is considered as
+       finished.
+     */
+    constexpr float egReleaseThreshold = 1e-4;
     /**
        Default metadata for MIDIName documents
      */