diff --git a/src/sfizz/Defaults.cpp b/src/sfizz/Defaults.cpp
index 10375e86..b20b7db7 100644
--- a/src/sfizz/Defaults.cpp
+++ b/src/sfizz/Defaults.cpp
@@ -84,7 +84,7 @@ FloatSpec crossfadeOutNorm { 1.0f, {0.0f, 1.0f}, 0 };
 FloatSpec ampKeytrack { 0.0f, {-96.0f, 12.0f}, 0 };
 FloatSpec ampVeltrack { 100.0f, {-100.0f, 100.0f}, kNormalizePercent };
 FloatSpec ampVelcurve { 0.0f, {0.0f, 1.0f}, 0 };
-FloatSpec ampRandom { 0.0f, {0.0f, 24.0f}, 0 };
+FloatSpec ampRandom { 0.0f, {-24.0f, 24.0f}, 0 };
 BoolSpec rtDead { false, {false, true}, 0 };
 FloatSpec rtDecay { 0.0f, {0.0f, 200.0f}, 0 };
 FloatSpec filterCutoff { 0.0f, {0.0f, 20000.0f}, kEnforceUpperBound };
@@ -93,7 +93,7 @@ FloatSpec filterResonance { 0.0f, {0.0f, 96.0f}, 0 };
 FloatSpec filterResonanceMod { 0.0f, {0.0f, 96.0f}, 0 };
 FloatSpec filterGain { 0.0f, {-96.0f, 96.0f}, 0 };
 FloatSpec filterGainMod { 0.0f, {-96.0f, 96.0f}, 0 };
-FloatSpec filterRandom { 0.0f, {0.0f, 12000.0f}, 0 };
+FloatSpec filterRandom { 0.0f, {-12000.0f, 12000.0f}, 0 };
 Int32Spec filterKeytrack { 0, {0, 1200}, 0 };
 Int32Spec filterVeltrack { 0, {-12000, 12000}, 0 };
 FloatSpec eqBandwidth { 1.0f, {0.001f, 4.0f}, 0 };
@@ -105,7 +105,7 @@ FloatSpec eqGainMod { 0.0f, {-96.0f, 96.0f}, 0 };
 FloatSpec eqVel2Frequency { 0.0f, {-30000.0f, 30000.0f}, 0 };
 FloatSpec eqVel2Gain { 0.0f, {-96.0f, 96.0f}, 0 };
 Int32Spec pitchKeytrack { 100, {-1200, 1200}, 0 };
-FloatSpec pitchRandom { 0.0f, {0.0f, 12000.0f}, 0 };
+FloatSpec pitchRandom { 0.0f, {-12000.0f, 12000.0f}, 0 };
 Int32Spec pitchVeltrack { 0, {-12000, 12000}, 0 };
 Int32Spec transpose { 0, {-127, 127}, 0 };
 FloatSpec pitch { 0.0f, {-2400.0f, 2400.0f}, 0 };
diff --git a/src/sfizz/FilterPool.cpp b/src/sfizz/FilterPool.cpp
index 46b38d41..42427a8c 100644
--- a/src/sfizz/FilterPool.cpp
+++ b/src/sfizz/FilterPool.cpp
@@ -30,7 +30,7 @@ void sfz::FilterHolder::setup(const Region& region, unsigned filterId, int noteN
     // Setup the base values
     baseCutoff = description->cutoff;
     if (description->random != 0) {
-        fast_real_distribution<float> dist { -description->random, description->random };
+        fast_real_distribution<float> dist { 0.0f, description->random };
         baseCutoff *= centsFactor(dist(Random::randomGenerator));
     }
     const auto keytrack = description->keytrack * (noteNumber - description->keycenter);
diff --git a/src/sfizz/Region.cpp b/src/sfizz/Region.cpp
index c866a96a..40e80fed 100644
--- a/src/sfizz/Region.cpp
+++ b/src/sfizz/Region.cpp
@@ -1586,7 +1586,7 @@ float sfz::Region::getBasePitchVariation(float noteNumber, float velocity) const
 {
     ASSERT(velocity >= 0.0f && velocity <= 1.0f);
 
-    fast_real_distribution<float> pitchDistribution { -pitchRandom, pitchRandom };
+    fast_real_distribution<float> pitchDistribution { 0.0f, pitchRandom };
     auto pitchVariationInCents = pitchKeytrack * (noteNumber - pitchKeycenter); // note difference with pitch center
     pitchVariationInCents += pitch; // sample tuning
     pitchVariationInCents += config::centPerSemitone * transpose; // sample transpose
@@ -1597,7 +1597,7 @@ float sfz::Region::getBasePitchVariation(float noteNumber, float velocity) const
 
 float sfz::Region::getBaseVolumedB(int noteNumber) const noexcept
 {
-    fast_real_distribution<float> volumeDistribution { -ampRandom, ampRandom };
+    fast_real_distribution<float> volumeDistribution { 0.0f, ampRandom };
     auto baseVolumedB = volume + volumeDistribution(Random::randomGenerator);
     baseVolumedB += globalVolume;
     baseVolumedB += masterVolume;
diff --git a/tests/RegionValuesT.cpp b/tests/RegionValuesT.cpp
index 91df9ba0..5c0ae4b3 100644
--- a/tests/RegionValuesT.cpp
+++ b/tests/RegionValuesT.cpp
@@ -1949,7 +1949,7 @@ TEST_CASE("[Values] Pitch Random")
     std::vector<std::string> expected {
         "/region0/pitch_random,f : { 0 }",
         "/region1/pitch_random,f : { 10 }",
-        "/region2/pitch_random,f : { 0 }",
+        "/region2/pitch_random,f : { -4 }",
     };
     REQUIRE(messageList == expected);
 }