Typo fixes

+ User facing typos
+ trivial source comment typos
+ superflous double whitespace issues
+ found redundant comment typo
Found using `codespell -q 3 --skip="./build/wix/Localization,./res/translations,./lib" -I ../mixxx-whitelist.txt` where the contents of the whitelist were:
```
iff
freee
substract
```

68 files changed, 95 insertions, 95 deletions

diff --git a/src/control/control.h b/src/control/control.h
index ea3fded2f7..28773663c6 100644
--- a/src/control/control.h
+++ b/src/control/control.h
@@ -141,7 +141,7 @@ class ControlDoublePrivate : public QObject {
     // User-visible, i18n name for what the control is.
     QString m_name;
 
-    // User-visible, i18n descripton for what the control does.
+    // User-visible, i18n description for what the control does.
     QString m_description;
 
     // Whether to ignore sets which would have no effect.
diff --git a/src/control/controlbehavior.cpp b/src/control/controlbehavior.cpp
index 799e5d20c6..89f294d7ef 100644
--- a/src/control/controlbehavior.cpp
+++ b/src/control/controlbehavior.cpp
@@ -238,7 +238,7 @@ double ControlAudioTaperPotBehavior::midiToParameter(double midiValue) {
             dParam = midiValue /
                     (127.0 + m_midiCorrection / m_neutralParameter);
         } else {
-            // m_midicorrection is allways < 1, so NaN check required
+            // m_midicorrection is always < 1, so NaN check required
             dParam = (midiValue - m_midiCorrection / m_neutralParameter) /
                     (127.0 - m_midiCorrection / m_neutralParameter);
         }
diff --git a/src/control/controlbehavior.h b/src/control/controlbehavior.h
index a1046bb36f..08f48b724b 100644
--- a/src/control/controlbehavior.h
+++ b/src/control/controlbehavior.h
@@ -116,7 +116,7 @@ class ControlAudioTaperPotBehavior : public ControlPotmeterBehavior {
     double m_offset;
     // ensures that the neutral position on a integer midi value
     // This value is subtracted from the Midi value at neutral position
-    // and is allways < 1
+    // and is always < 1
     double m_midiCorrection;
 };
 
diff --git a/src/control/controlvalue.h b/src/control/controlvalue.h
index 8819ce92f5..7a13247f16 100644
--- a/src/control/controlvalue.h
+++ b/src/control/controlvalue.h
@@ -12,7 +12,7 @@
 // for lock free access, this value has to be >= the number of value using threads
 // value must be a fraction of an integer
 const int cRingSize = 8;
-// there are basicly unlimited readers allowed at each ring element
+// there are basically unlimited readers allowed at each ring element
 // but we have to count them so max() is just fine.
 // NOTE(rryan): Wrapping max with parentheses avoids conflict with the max macro
 // defined in windows.h.
@@ -76,9 +76,9 @@ class ControlValueAtomicBase {
             // 2) the formerly current value is locked by a writer
             // Case 1 does not happen because we have enough (0x7fffffff) reader slots.
             // Case 2 happens when the a reader is delayed after reading the
-            // m_currentIndex and in the mean while a reader locks the formaly current value
+            // m_currentIndex and in the mean while a reader locks the formally current value
             // because it has written cRingSize times. Reading the less recent value will fix
-            // it because it is now actualy the current value.
+            // it because it is now actually the current value.
             index = (index - 1) % (cRingSize);
         }
         return value;
diff --git a/src/controllers/controllerenumerator.h b/src/controllers/controllerenumerator.h
index f2378e8197..b94c538389 100644
--- a/src/controllers/controllerenumerator.h
+++ b/src/controllers/controllerenumerator.h
@@ -24,7 +24,7 @@ class ControllerEnumerator : public QObject {
     virtual QList<Controller*> queryDevices() = 0;
 
     // Sub-classes return true here if their devices must be polled to get data
-    // from the controler.
+    // from the controller.
     virtual bool needPolling() {
         return false;
     }
diff --git a/src/controllers/midi/midimessage.h b/src/controllers/midi/midimessage.h
index 57aa5e2748..5e04d07ef3 100644
--- a/src/controllers/midi/midimessage.h
+++ b/src/controllers/midi/midimessage.h
@@ -81,7 +81,7 @@ struct MidiOptions {
             bool rot64_fast    : 1;
             bool diff          : 1;
             bool button        : 1;    // Button Down (!=00) and Button Up (00) events happen together
-            bool sw            : 1;    // button down (!=00) and button up (00) events happen seperately
+            bool sw            : 1;    // button down (!=00) and button up (00) events happen separately
             bool spread64      : 1;    // accelerated difference from 64
             bool herc_jog      : 1;    // generic Hercules range correction 0x01 -> +1; 0x7f -> -1
             bool selectknob    : 1;    // relative knob which can be turned forever and outputs a signed value
diff --git a/src/effects/native/autopaneffect.cpp b/src/effects/native/autopaneffect.cpp
index ea368b9911..4df379f659 100644
--- a/src/effects/native/autopaneffect.cpp
+++ b/src/effects/native/autopaneffect.cpp
@@ -140,7 +140,7 @@ void AutoPanEffect::processChannel(
     //       1  / ( 1 - 2 * stepfrac)
     float a = smoothing != 0.5f ? 1.0f / (1.0f - smoothing * 2.0f) : 1.0f;
 
-    // size of a segment of slope (controled by the "smoothing" parameter)
+    // size of a segment of slope (controlled by the "smoothing" parameter)
     float u = (0.5f - smoothing) / 2.0f;
 
     gs.frac.setRampingThreshold(kPositionRampingThreshold);
diff --git a/src/encoder/encoderffmpegcore.h b/src/encoder/encoderffmpegcore.h
index a9ed018b16..908b5d3ff1 100644
--- a/src/encoder/encoderffmpegcore.h
+++ b/src/encoder/encoderffmpegcore.h
@@ -25,7 +25,7 @@ extern "C" {
 #include <libavutil/avutil.h>
 #endif
 
-// Compability
+// Compatibility
 #include <libavutil/mathematics.h>
 #include <libavutil/opt.h>
 }
diff --git a/src/encoder/encodermp3.cpp b/src/encoder/encodermp3.cpp
index 01fa91e686..7503a48635 100644
--- a/src/encoder/encodermp3.cpp
+++ b/src/encoder/encodermp3.cpp
@@ -24,7 +24,7 @@
 #include "errordialoghandler.h"
 
 // Automatic thresholds for switching the encoder to mono
-// They have been choosen by testing and to keep the same number
+// They have been chosen by testing and to keep the same number
 // of values for the slider.
 // The threshold of bitrate (CBR/ABR) at which the encoder
 // with switch to mono encoding
@@ -393,7 +393,7 @@ int EncoderMp3::initEncoder(int samplerate, QString errorMessage) {
     }
 
     unsigned long samplerate_in = samplerate;
-    // samplerate_out 0 means "let LAME pick the appropiate one"
+    // samplerate_out 0 means "let LAME pick the appropriate one"
     unsigned long samplerate_out = (samplerate_in > 48000 ? 48000 : 0);
 
     m_lameFlags = lame_init();
diff --git a/src/encoder/encodervorbis.cpp b/src/encoder/encodervorbis.cpp
index a386232473..fa7d053bca 100644
--- a/src/encoder/encodervorbis.cpp
+++ b/src/encoder/encodervorbis.cpp
@@ -27,7 +27,7 @@ http://svn.xiph.org/trunk/vorbis/examples/encoder_example.c
 #include "errordialoghandler.h"
 
 // Automatic thresholds for switching the encoder to mono
-// They have been choosen by testing and to keep the same number
+// They have been chosen by testing and to keep the same number
 // of values for the slider.
 // The threshold of bitrate at which the encoder
 // with switch to mono encoding
diff --git a/src/engine/cuecontrol.cpp b/src/engine/cuecontrol.cpp
index 2a4436a1a6..6eeb4ef19f 100644
--- a/src/engine/cuecontrol.cpp
+++ b/src/engine/cuecontrol.cpp
@@ -998,7 +998,7 @@ bool CueControl::isPlayingByPlayButton() {
 ConfigKey HotcueControl::keyForControl(int hotcue, const char* name) {
     ConfigKey key;
     key.group = m_group;
-    // Add one to hotcue so that we dont have a hotcue_0
+    // Add one to hotcue so that we don't have a hotcue_0
     key.item = QLatin1String("hotcue_") % QString::number(hotcue+1) % "_" % name;
     return key;
 }
diff --git a/src/engine/enginebuffer.cpp b/src/engine/enginebuffer.cpp
index 1218f017b6..8fe8b2b242 100644
--- a/src/engine/enginebuffer.cpp
+++ b/src/engine/enginebuffer.cpp
@@ -886,7 +886,7 @@ void EngineBuffer::process(CSAMPLE* pOutput, const int iBufferSize) {
         // and its distance to the original track pitch
         //
         // The Pitch_Adjust knob does not reflect the speedSliderPitchRatio.
-        // So it is is useful for controller mappings, because it is not
+        // So it is useful for controller mappings, because it is not
         // changed by the speed slider or keylock.
 
         // In the second part all other speed changing controls are processed.
diff --git a/src/engine/enginebufferscalelinear.cpp b/src/engine/enginebufferscalelinear.cpp
index 23c1f9c66f..4a186e4d87 100644
--- a/src/engine/enginebufferscalelinear.cpp
+++ b/src/engine/enginebufferscalelinear.cpp
@@ -238,7 +238,7 @@ SINT EngineBufferScaleLinear::do_scale(CSAMPLE* buf, SINT buf_size) {
 
     // Hot frame loop
     while (i < buf_size) {
-        // shift indicies
+        // shift indices
         m_dCurrentFrame = m_dNextFrame;
 
         // Because our index is a float value, we're going to be interpolating
diff --git a/src/engine/keycontrol.h b/src/engine/keycontrol.h
index b97f3567c2..947c647ebc 100644
--- a/src/engine/keycontrol.h
+++ b/src/engine/keycontrol.h
@@ -14,7 +14,7 @@ class KeyControl : public EngineControl {
 
     struct PitchTempoRatio {
         // this is the calculated value used by engine buffer for pitch
-        // by default is is equal to the tempoRatio set by the speed slider
+        // by default it is equal to the tempoRatio set by the speed slider
         double pitchRatio;
         // this is the value of the speed slider and speed slider
         // effecting controls at the moment of calculation
diff --git a/src/engine/positionscratchcontroller.cpp b/src/engine/positionscratchcontroller.cpp
index 4d9df9eb5c..a35269d0de 100644
--- a/src/engine/positionscratchcontroller.cpp
+++ b/src/engine/positionscratchcontroller.cpp
@@ -107,7 +107,7 @@ void PositionScratchController::process(double currentSample, double releaseRate
 
     // Sample Mouse with fixed timing intervals to iron out significant jitters
     // that are added on the way from mouse to engine thread
-    // Normaly the Mouse is sampled every 8 ms so with this 16 ms window we
+    // Normally the Mouse is sampled every 8 ms so with this 16 ms window we
     // have 0 ... 3 samples. The remaining jitter is ironed by the following IIR
     // lowpass filter
     const double m_dMouseSampeIntervall = 0.016;
diff --git a/src/library/basesqltablemodel.cpp b/src/library/basesqltablemodel.cpp
index 3b79392348..7beac213fd 100644
--- a/src/library/basesqltablemodel.cpp
+++ b/src/library/basesqltablemodel.cpp
@@ -512,7 +512,7 @@ void BaseSqlTableModel::setSort(int column, Qt::SortOrder order) {
 
     // we have two selects for sorting, since keeping the select history
     // across the two selects is hard, we do this only for the trackSource
-    // this is OK, because the colums of the table are virtual in case of
+    // this is OK, because the columns of the table are virtual in case of
     // preview column or individual like playlist track number so that we
     // do not need the history anyway.
 
diff --git a/src/library/browse/foldertreemodel.cpp b/src/library/browse/foldertreemodel.cpp
index 3c51828f15..a91cb8eae0 100644
--- a/src/library/browse/foldertreemodel.cpp
+++ b/src/library/browse/foldertreemodel.cpp
@@ -34,7 +34,7 @@ FolderTreeModel::~FolderTreeModel() {
  */
 bool FolderTreeModel::hasChildren(const QModelIndex& parent) const {
     TreeItem *item = static_cast<TreeItem*>(parent.internalPointer());
-    /* Usually the child count is 0 becuase we do lazy initalization
+    /* Usually the child count is 0 because we do lazy initialization
      * However, for, buid-in items such as 'Quick Links' there exist
      * child items at init time
      */
diff --git a/src/library/coverartdelegate.h b/src/library/coverartdelegate.h
index d510c1d006..b1d500ac47 100644
--- a/src/library/coverartdelegate.h
+++ b/src/library/coverartdelegate.h
@@ -28,7 +28,7 @@ class CoverArtDelegate : public QStyledItemDelegate {
     // It means that in this cases it will just draw
     // covers which are already in the pixmapcache.
     //
-    // It is useful to handle cases when the user scoll down
+    // It is useful to handle cases when the user scroll down
     // very fast or when they hold an arrow key, because
     // in these cases 'paint()' would be called very often
     // and it might make CoverDelegate starts many searches,
diff --git a/src/library/crate/cratestorage.cpp b/src/library/crate/cratestorage.cpp
index 05afdfcde2..2b8ee2ae67 100644
--- a/src/library/crate/cratestorage.cpp
+++ b/src/library/crate/cratestorage.cpp
@@ -538,7 +538,7 @@ QSet<CrateId> CrateStorage::collectCrateIdsOfTracks(const QList<TrackId>& trackI
     QSet<CrateId> trackCrates;
     for (const auto& trackId: trackIds) {
         // NOTE(uklotzde): The query result does not need to be sorted by crate id
-        // here. But since the coresponding FK column is indexed the impact on the
+        // here. But since the corresponding FK column is indexed the impact on the
         // performance should be negligible. By reusing an existing query we reduce
         // the amount of code and the number of prepared SQL queries.
         CrateTrackSelectResult crateTracks(selectTrackCratesSorted(trackId));
diff --git a/src/library/dao/playlistdao.cpp b/src/library/dao/playlistdao.cpp
index 23cd96d7ed..e05a524420 100644
--- a/src/library/dao/playlistdao.cpp
+++ b/src/library/dao/playlistdao.cpp
@@ -791,11 +791,11 @@ void PlaylistDAO::moveTrack(const int playlistId, const int oldPosition, const i
      // Case 2: destination > source (newPos > oldPos)
      //   1) Set position=-1 where pos=source -- Give track a dummy index again.
      //   2) Decrement position where pos > source AND pos <= dest
-     //   3) Set postion=dest where pos=-1 -- Move that track from dummy pos to final destination
+     //   3) Set position=dest where pos=-1 -- Move that track from dummy pos to final destination
 
     QString queryString;
 
-    // Move moved track to  dummy position -1
+    // Move moved track to dummy position -1
     queryString = QString("UPDATE PlaylistTracks SET position=-1 "
                           "WHERE position=%1 AND "
                           "playlist_id=%2").arg(QString::number(oldPosition),
diff --git a/src/library/export/trackexportworker.cpp b/src/library/export/trackexportworker.cpp
index f4ec52fc25..2c14617fd3 100644
--- a/src/library/export/trackexportworker.cpp
+++ b/src/library/export/trackexportworker.cpp
@@ -179,7 +179,7 @@ TrackExportWorker::OverwriteAnswer TrackExportWorker::makeOverwriteRequest(
         m_overwriteMode = OverwriteMode::OVERWRITE_ALL;
         break;
     case OverwriteAnswer::CANCEL:
-        // Handle cancelation as a result of the question.
+        // Handle cancellation as a result of the question.
         m_errorMessage = tr("Export process was canceled");
         stop();
         break;
diff --git a/src/library/itunes/itunesfeature.cpp b/src/library/itunes/itunesfeature.cpp
index fa13586498..161863f13a 100644
--- a/src/library/itunes/itunesfeature.cpp
+++ b/src/library/itunes/itunesfeature.cpp
@@ -156,7 +156,7 @@ void ITunesFeature::activate(bool forceReload) {
             settings.setValue(ITDB_PATH_KEY, m_dbfile);
         }
         m_isActivated =  true;
-        // Ususally the maximum number of threads
+        // Usually the maximum number of threads
         // is > 2 depending on the CPU cores
         // Unfortunately, within VirtualBox
         // the maximum number of allowed threads
diff --git a/src/library/library.cpp b/src/library/library.cpp
index 5a22fe9f84..7d94a9c9d4 100644
--- a/src/library/library.cpp
+++ b/src/library/library.cpp
@@ -52,7 +52,7 @@ const QString Library::kConfigGroup("[Library]");
 //static
 const ConfigKey Library::kConfigKeyRepairDatabaseOnNextRestart(kConfigGroup, "RepairDatabaseOnNextRestart");
 
-// This is is the name which we use to register the WTrackTableView with the
+// This is the name which we use to register the WTrackTableView with the
 // WLibrary
 const QString Library::m_sTrackViewName = QString("WTrackTableView");
 
diff --git a/src/library/parsercsv.cpp b/src/library/parsercsv.cpp
index 16ffd1787b..f26ea33015 100644
--- a/src/library/parsercsv.cpp
+++ b/src/library/parsercsv.cpp
@@ -1,7 +1,7 @@
 //
 // C++ Implementation: parsercsv
 //
-// Description: module to parse Comma-Separated Values (CSV) formated playlists (rfc4180)
+// Description: module to parse Comma-Separated Values (CSV) formatted playlists (rfc4180)
 //
 //
 // Author: Ingo Kossyk <kossyki@cs.tu-berlin.de>, (C) 2004
diff --git a/src/library/parsercsv.h b/src/library/parsercsv.h
index 8451a146e2..57f92a5f6c 100644
--- a/src/library/parsercsv.h
+++ b/src/library/parsercsv.h
@@ -1,7 +1,7 @@
 //
 // C++ Interface: parserm3u
 //
-// Description: Interface header parse Comma-Separated Values (CSV) formated playlists (rfc4180)
+// Description: Interface header parse Comma-Separated Values (CSV) formatted playlists (rfc4180)
 //
 //
 // Author: Ingo Kossyk <kossyki@cs.tu-berlin.de>, (C) 2004
diff --git a/src/library/parserm3u.cpp b/src/library/parserm3u.cpp
index 1e1c7928be..9483a695e1 100644
--- a/src/library/parserm3u.cpp
+++ b/src/library/parserm3u.cpp
@@ -1,7 +1,7 @@
 //
 // C++ Implementation: parserm3u
 //
-// Description: module to parse m3u(plaintext) formated playlists
+// Description: module to parse m3u(plaintext) formatted playlists
 //
 //
 // Author: Ingo Kossyk <kossyki@cs.tu-berlin.de>, (C) 2004
@@ -25,14 +25,14 @@
 
 /**
    ToDo:
-    - parse ALL informations from the pls file if available ,
+    - parse ALL information from the pls file if available ,
           not only the filepath;
 
           Userinformation :
           The M3U format is just a headerless plaintext format
           where every line of text either represents
           a file location or a comment. comments are being
-          preceeded by a '#'. This parser will try to parse all
+          preceded by a '#'. Th