diff --git a/src/visual/MeterCanvas.cpp b/src/visual/MeterCanvas.cpp
new file mode 100644
index 0000000..61989b9
--- /dev/null
+++ b/src/visual/MeterCanvas.cpp
@@ -0,0 +1,131 @@
+#include "MeterCanvas.h"
+
+#include "wx/wxprec.h"
+
+#ifndef WX_PRECOMP
+#include "wx/wx.h"
+#endif
+
+#if !wxUSE_GLCANVAS
+#error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
+#endif
+
+#include "CubicSDR.h"
+#include "CubicSDRDefs.h"
+#include "AppFrame.h"
+#include <algorithm>
+
+wxBEGIN_EVENT_TABLE(MeterCanvas, wxGLCanvas) EVT_PAINT(MeterCanvas::OnPaint)
+EVT_IDLE(MeterCanvas::OnIdle)
+EVT_MOTION(MeterCanvas::mouseMoved)
+EVT_LEFT_DOWN(MeterCanvas::mouseDown)
+EVT_LEFT_UP(MeterCanvas::mouseReleased)
+EVT_LEAVE_WINDOW(MeterCanvas::mouseLeftWindow)
+EVT_ENTER_WINDOW(MeterCanvas::mouseEnterWindow)
+wxEND_EVENT_TABLE()
+
+MeterCanvas::MeterCanvas(wxWindow *parent, int *attribList) :
+        wxGLCanvas(parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize,
+        wxFULL_REPAINT_ON_RESIZE), parent(parent), level(0), level_max(1), inputValue(0), userInputValue(0), shiftDown(false), altDown(false), ctrlDown(false) {
+
+    glContext = new MeterContext(this, &wxGetApp().GetContext(this));
+    mTracker.setTarget(this);
+}
+
+MeterCanvas::~MeterCanvas() {
+
+}
+
+void MeterCanvas::setLevel(float level_in) {
+    level = level_in;
+}
+float MeterCanvas::getLevel() {
+    return level;
+}
+
+void MeterCanvas::setMax(float max_in) {
+    level_max = max_in;
+}
+
+bool MeterCanvas::setInputValue(float slider_in) {
+    userInputValue = inputValue = slider_in;
+}
+bool MeterCanvas::inputChanged() {
+    return (inputValue != userInputValue);
+}
+float MeterCanvas::getInputValue() {
+    inputValue = userInputValue;
+    return userInputValue;
+}
+
+void MeterCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
+    wxPaintDC dc(this);
+    const wxSize ClientSize = GetClientSize();
+
+    glContext->SetCurrent(*this);
+    glViewport(0, 0, ClientSize.x, ClientSize.y);
+
+    glContext->DrawBegin();
+    if (mTracker.mouseInView()) {
+        glContext->Draw(0.4, 0.4, 0.4, 0.5, mTracker.getMouseY());
+    }
+
+    glContext->Draw(0.1, 0.75, 0.1, 0.5, level/level_max);
+
+    glContext->Draw(0.75, 0.1, 0.1, 0.5, userInputValue/level_max);
+
+    glContext->DrawEnd();
+
+    SwapBuffers();
+}
+
+void MeterCanvas::OnIdle(wxIdleEvent &event) {
+    Refresh(false);
+}
+
+void MeterCanvas::mouseMoved(wxMouseEvent& event) {
+    mTracker.OnMouseMoved(event);
+
+    shiftDown = event.ShiftDown();
+    altDown = event.AltDown();
+    ctrlDown = event.ControlDown();
+
+    if (mTracker.mouseDown()) {
+        userInputValue = mTracker.getMouseY()*level_max;
+    }
+}
+
+void MeterCanvas::mouseDown(wxMouseEvent& event) {
+    mTracker.OnMouseDown(event);
+
+    shiftDown = event.ShiftDown();
+    altDown = event.AltDown();
+    ctrlDown = event.ControlDown();
+
+    userInputValue = mTracker.getMouseY()*level_max;
+    mTracker.setHorizDragLock(true);
+}
+
+void MeterCanvas::mouseWheelMoved(wxMouseEvent& event) {
+    mTracker.OnMouseWheelMoved(event);
+}
+
+void MeterCanvas::mouseReleased(wxMouseEvent& event) {
+    mTracker.OnMouseReleased(event);
+
+    shiftDown = event.ShiftDown();
+    altDown = event.AltDown();
+    ctrlDown = event.ControlDown();
+
+    userInputValue = mTracker.getMouseY()*level_max;
+}
+
+void MeterCanvas::mouseLeftWindow(wxMouseEvent& event) {
+    mTracker.OnMouseLeftWindow(event);
+    SetCursor(wxCURSOR_CROSS);
+}
+
+void MeterCanvas::mouseEnterWindow(wxMouseEvent& event) {
+    mTracker.OnMouseEnterWindow(event);
+    SetCursor(wxCURSOR_CROSS);
+}
diff --git a/src/visual/MeterCanvas.h b/src/visual/MeterCanvas.h
new file mode 100644
index 0000000..67da7e5
--- /dev/null
+++ b/src/visual/MeterCanvas.h
@@ -0,0 +1,57 @@
+#pragma once
+
+#include "wx/glcanvas.h"
+#include "wx/timer.h"
+
+#include <vector>
+#include <queue>
+
+#include "MeterContext.h"
+#include "MouseTracker.h"
+
+#include "fftw3.h"
+#include "Timer.h"
+
+class MeterCanvas: public wxGLCanvas {
+public:
+    std::vector<float> waveform_points;
+
+    MeterCanvas(wxWindow *parent, int *attribList = NULL);
+    ~MeterCanvas();
+
+    void setLevel(float level_in);
+    float getLevel();
+
+    void setMax(float max_in);
+
+    bool setInputValue(float slider_in);
+    bool inputChanged();
+    float getInputValue();
+
+private:
+    void OnPaint(wxPaintEvent& event);
+    void OnIdle(wxIdleEvent &event);
+
+    void mouseMoved(wxMouseEvent& event);
+    void mouseDown(wxMouseEvent& event);
+    void mouseWheelMoved(wxMouseEvent& event);
+    void mouseReleased(wxMouseEvent& event);
+    void mouseEnterWindow(wxMouseEvent& event);
+    void mouseLeftWindow(wxMouseEvent& event);
+
+    MouseTracker mTracker;
+    wxWindow *parent;
+    MeterContext *glContext;
+
+    float level;
+    float level_max;
+
+    float inputValue;
+    float userInputValue;
+
+    bool shiftDown;
+    bool altDown;
+    bool ctrlDown;
+wxDECLARE_EVENT_TABLE();
+};
+
diff --git a/src/visual/MeterContext.cpp b/src/visual/MeterContext.cpp
new file mode 100644
index 0000000..40fe4fd
--- /dev/null
+++ b/src/visual/MeterContext.cpp
@@ -0,0 +1,40 @@
+#include "MeterContext.h"
+#include "MeterCanvas.h"
+
+MeterContext::MeterContext(MeterCanvas *canvas, wxGLContext *sharedContext) :
+        PrimaryGLContext(canvas, sharedContext) {
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+}
+
+void MeterContext::DrawBegin() {
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    glDisable(GL_TEXTURE_2D);
+}
+
+void MeterContext::Draw(float r, float g, float b, float a, float level) {
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_ONE, GL_ONE);
+    glColor4f(r, g, b, a);
+    glBegin(GL_QUADS);
+    glVertex2f(1.0, -1.0 + 2.0 * level);
+    glVertex2f(-1.0, -1.0 + 2.0 * level);
+    glVertex2f(-1.0, -1.0);
+    glVertex2f(1.0, -1.0);
+    glEnd();
+    glDisable(GL_BLEND);
+}
+
+void MeterContext::DrawEnd() {
+    glFlush();
+
+    CheckGLError();
+}
+
diff --git a/src/visual/MeterContext.h b/src/visual/MeterContext.h
new file mode 100644
index 0000000..3fac2f2
--- /dev/null
+++ b/src/visual/MeterContext.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "PrimaryGLContext.h"
+#include "Gradient.h"
+
+#define NUM_WATERFALL_LINES 512
+
+class MeterCanvas;
+
+class MeterContext: public PrimaryGLContext {
+public:
+    MeterContext(MeterCanvas *canvas, wxGLContext *sharedContext);
+
+    void DrawBegin();
+    void Draw(float r, float g, float b, float a, float level);
+    void DrawEnd();
+
+private:
+};