diff --git a/CHANGELOG.md b/CHANGELOG.md
index e471dcf..3f0473f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Slider min value for a bipolar parameter should be -1.
 
 ## [1.1.0] - 2022-03-10
 ### Added
diff --git a/addons/gdfxr/editor/Editor.tscn b/addons/gdfxr/editor/Editor.tscn
index da858f0..3641981 100644
--- a/addons/gdfxr/editor/Editor.tscn
+++ b/addons/gdfxr/editor/Editor.tscn
@@ -221,6 +221,7 @@ margin_right = 211.0
 margin_bottom = 126.0
 label = "Change Amount"
 parameter = "p_arp_mod"
+bipolar = true
 
 [node name="ParamSlider6" parent="Editor/ScrollContainer/Params/Envolope" instance=ExtResource( 3 )]
 margin_top = 130.0
@@ -260,6 +261,7 @@ margin_right = 210.0
 margin_bottom = 74.0
 label = "Slide"
 parameter = "p_freq_ramp"
+bipolar = true
 
 [node name="ParamSlider4" parent="Editor/ScrollContainer/Params/Frequency" instance=ExtResource( 3 )]
 margin_top = 78.0
@@ -267,6 +269,7 @@ margin_right = 210.0
 margin_bottom = 100.0
 label = "Delta Slide"
 parameter = "p_freq_dramp"
+bipolar = true
 
 [node name="ParamSlider5" parent="Editor/ScrollContainer/Params/Frequency" instance=ExtResource( 3 )]
 margin_top = 104.0
@@ -313,6 +316,7 @@ margin_right = 220.0
 margin_bottom = 74.0
 label = "Duty Sweep"
 parameter = "p_duty_ramp"
+bipolar = true
 
 [node name="ParamSlider5" parent="Editor/ScrollContainer/Params/Waveform" instance=ExtResource( 3 )]
 margin_top = 78.0
@@ -320,6 +324,7 @@ margin_right = 220.0
 margin_bottom = 100.0
 label = "Phaser Offset"
 parameter = "p_pha_offset"
+bipolar = true
 
 [node name="ParamSlider3" parent="Editor/ScrollContainer/Params/Waveform" instance=ExtResource( 3 )]
 margin_top = 104.0
@@ -327,6 +332,7 @@ margin_right = 220.0
 margin_bottom = 126.0
 label = "Phaser Sweep"
 parameter = "p_pha_ramp"
+bipolar = true
 
 [node name="Filter" type="VBoxContainer" parent="Editor/ScrollContainer/Params"]
 margin_left = 653.0
@@ -345,6 +351,7 @@ margin_right = 242.0
 margin_bottom = 48.0
 label = "Low-pass Sweep"
 parameter = "p_lpf_ramp"
+bipolar = true
 
 [node name="ParamSlider5" parent="Editor/ScrollContainer/Params/Filter" instance=ExtResource( 3 )]
 margin_top = 52.0
@@ -366,6 +373,7 @@ margin_right = 242.0
 margin_bottom = 126.0
 label = "High-pass Sweep"
 parameter = "p_hpf_ramp"
+bipolar = true
 
 [node name="PluginTranslator" parent="." instance=ExtResource( 5 )]
 
diff --git a/addons/gdfxr/editor/ParamSlider.gd b/addons/gdfxr/editor/ParamSlider.gd
index 3fc6f79..a501800 100644
--- a/addons/gdfxr/editor/ParamSlider.gd
+++ b/addons/gdfxr/editor/ParamSlider.gd
@@ -6,6 +6,7 @@ signal param_reset(name)
 
 export var label: String setget set_label
 export var parameter: String
+export var bipolar := false setget set_bipolar
 
 
 func set_label(v: String) -> void:
@@ -13,6 +14,14 @@ func set_label(v: String) -> void:
 	$Label.text = v
 
 
+func set_bipolar(v: bool) -> void:
+	bipolar = v
+	if bipolar:
+		$HSlider.min_value = -1.0
+	else:
+		$HSlider.min_value = 0.0
+
+
 func set_value(v: float) -> void:
 	$HSlider.value = v
 
diff --git a/addons/gdfxr/editor/ParamSlider.tscn b/addons/gdfxr/editor/ParamSlider.tscn
index 2f78a3d..e556e9f 100644
--- a/addons/gdfxr/editor/ParamSlider.tscn
+++ b/addons/gdfxr/editor/ParamSlider.tscn
@@ -8,9 +8,6 @@ margin_right = 253.0
 margin_bottom = 40.0
 size_flags_horizontal = 3
 script = ExtResource( 1 )
-__meta__ = {
-"_edit_use_anchors_": false
-}
 
 [node name="Label" type="Label" parent="."]
 margin_top = 13.0