diff --git a/src/toolbars/MixerToolBar.cpp b/src/toolbars/MixerToolBar.cpp
index 714ba0dca..15abdc502 100644
--- a/src/toolbars/MixerToolBar.cpp
+++ b/src/toolbars/MixerToolBar.cpp
@@ -119,6 +119,11 @@ void MixerToolBar::Populate()
                  wxFocusEventHandler(MixerToolBar::OnFocus),
                  NULL,
                  this);
+   // Show or hide the input slider based on whether it works
+   mInputSlider->Enable(gAudioIO->InputMixerWorks());
+   SetToolTips();
+
+   UpdateControls();
 
    // Add a little space
    Add(2, -1);
@@ -204,6 +209,9 @@ void MixerToolBar::UpdateControls()
    float playbackVolume;
    int inputSource;
 
+   // Show or hide the input slider based on whether it works
+   mInputSlider->Enable(gAudioIO->InputMixerWorks());
+
    gAudioIO->GetMixer(&inputSource, &inputVolume, &playbackVolume);
 
    if (mOutputSlider->Get() != playbackVolume) {