diff --git a/osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmapConverter.cs b/osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmapConverter.cs
index def22608d6..cc975c7def 100644
--- a/osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmapConverter.cs
+++ b/osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmapConverter.cs
@@ -27,8 +27,24 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// </summary>
         private const int max_notes_for_density = 7;
 
+        /// <summary>
+        /// The total number of columns.
+        /// </summary>
+        public int TotalColumns => TargetColumns * (Dual ? 2 : 1);
+
+        /// <summary>
+        /// The number of columns per-stage.
+        /// </summary>
         public int TargetColumns;
+
+        /// <summary>
+        /// Whether to double the number of stages.
+        /// </summary>
         public bool Dual;
+
+        /// <summary>
+        /// Whether the beatmap instantiated with is for the mania ruleset.
+        /// </summary>
         public readonly bool IsForCurrentRuleset;
 
         private readonly int originalTargetColumns;
@@ -152,7 +168,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// <returns>The hit objects generated.</returns>
         private IEnumerable<ManiaHitObject> generateSpecific(HitObject original, IBeatmap originalBeatmap)
         {
-            var generator = new SpecificBeatmapPatternGenerator(Random, original, beatmap, lastPattern, originalBeatmap);
+            var generator = new SpecificBeatmapPatternGenerator(Random, original, originalBeatmap, TotalColumns, lastPattern);
 
             foreach (var newPattern in generator.Generate())
             {
@@ -171,13 +187,13 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// <returns>The hit objects generated.</returns>
         private IEnumerable<ManiaHitObject> generateConverted(HitObject original, IBeatmap originalBeatmap)
         {
-            Patterns.PatternGenerator conversion = null;
+            Patterns.PatternGenerator? conversion = null;
 
             switch (original)
             {
                 case IHasPath:
                 {
-                    var generator = new PathObjectPatternGenerator(Random, original, beatmap, lastPattern, originalBeatmap);
+                    var generator = new PathObjectPatternGenerator(Random, original, originalBeatmap, TotalColumns, lastPattern);
                     conversion = generator;
 
                     var positionData = original as IHasPosition;
@@ -195,7 +211,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
 
                 case IHasDuration endTimeData:
                 {
-                    conversion = new EndTimeObjectPatternGenerator(Random, original, beatmap, lastPattern, originalBeatmap);
+                    conversion = new EndTimeObjectPatternGenerator(Random, original, originalBeatmap, TotalColumns, lastPattern);
 
                     recordNote(endTimeData.EndTime, new Vector2(256, 192));
                     computeDensity(endTimeData.EndTime);
@@ -206,7 +222,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
                 {
                     computeDensity(original.StartTime);
 
-                    conversion = new HitObjectPatternGenerator(Random, original, beatmap, lastPattern, lastTime, lastPosition, density, lastStair, originalBeatmap);
+                    conversion = new HitObjectPatternGenerator(Random, original, originalBeatmap, TotalColumns, lastPattern, lastTime, lastPosition, density, lastStair);
 
                     recordNote(original.StartTime, positionData.Position);
                     break;
@@ -231,8 +247,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
         /// </summary>
         private class SpecificBeatmapPatternGenerator : Patterns.Legacy.PatternGenerator
         {
-            public SpecificBeatmapPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
-                : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
+            public SpecificBeatmapPatternGenerator(LegacyRandom random, HitObject hitObject, IBeatmap beatmap, int totalColumns, Pattern previousPattern)
+                : base(random, hitObject, beatmap, previousPattern, totalColumns)
             {
             }
 
diff --git a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/EndTimeObjectPatternGenerator.cs b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/EndTimeObjectPatternGenerator.cs
index 2265d3d347..52bb87ae19 100644
--- a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/EndTimeObjectPatternGenerator.cs
+++ b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/EndTimeObjectPatternGenerator.cs
@@ -17,8 +17,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         private readonly int endTime;
         private readonly PatternType convertType;
 
-        public EndTimeObjectPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
-            : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
+        public EndTimeObjectPatternGenerator(LegacyRandom random, HitObject hitObject, IBeatmap beatmap, int totalColumns, Pattern previousPattern)
+            : base(random, hitObject, beatmap, previousPattern, totalColumns)
         {
             endTime = (int)((HitObject as IHasDuration)?.EndTime ?? 0);
 
diff --git a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs
index 27cb681300..ad45a3fb21 100644
--- a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs
+++ b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs
@@ -23,9 +23,9 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
         private readonly PatternType convertType;
 
-        public HitObjectPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, double previousTime, Vector2 previousPosition, double density,
-                                         PatternType lastStair, IBeatmap originalBeatmap)
-            : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
+        public HitObjectPatternGenerator(LegacyRandom random, HitObject hitObject, IBeatmap beatmap, int totalColumns, Pattern previousPattern, double previousTime, Vector2 previousPosition,
+                                         double density, PatternType lastStair)
+            : base(random, hitObject, beatmap, previousPattern, totalColumns)
         {
             StairType = lastStair;
 
diff --git a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PathObjectPatternGenerator.cs b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PathObjectPatternGenerator.cs
index 4922915c7d..6d593a75e7 100644
--- a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PathObjectPatternGenerator.cs
+++ b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PathObjectPatternGenerator.cs
@@ -31,8 +31,8 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
 
         private PatternType convertType;
 
-        public PathObjectPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
-            : base(random, hitObject, beatmap, previousPattern, originalBeatmap)
+        public PathObjectPatternGenerator(LegacyRandom random, HitObject hitObject, IBeatmap beatmap, int totalColumns, Pattern previousPattern)
+            : base(random, hitObject, beatmap, previousPattern, totalColumns)
         {
             convertType = PatternType.None;
             if (!Beatmap.ControlPointInfo.EffectPointAt(hitObject.StartTime).KiaiMode)
diff --git a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PatternGenerator.cs b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PatternGenerator.cs
index 77f93b4ef9..48b8778501 100644
--- a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PatternGenerator.cs
+++ b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PatternGenerator.cs
@@ -27,20 +27,12 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
         /// </summary>
         protected readonly LegacyRandom Random;
 
-        /// <summary>
-        /// The beatmap which <see cref="HitObject"/> is being converted from.
-        /// </summary>
-        protected readonly IBeatmap OriginalBeatmap;
-
-        protected PatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
-            : base(hitObject, beatmap, previousPattern)
+        protected PatternGenerator(LegacyRandom random, HitObject hitObject, IBeatmap beatmap, Pattern previousPattern, int totalColumns)
+            : base(hitObject, beatmap, totalColumns, previousPattern)
         {
             ArgumentNullException.ThrowIfNull(random);
-            ArgumentNullException.ThrowIfNull(originalBeatmap);
 
             Random = random;
-            OriginalBeatmap = originalBeatmap;
-
             RandomStart = TotalColumns == 8 ? 1 : 0;
         }
 
@@ -104,17 +96,17 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                 if (conversionDifficulty != null)
                     return conversionDifficulty.Value;
 
-                HitObject lastObject = OriginalBeatmap.HitObjects.LastOrDefault();
-                HitObject firstObject = OriginalBeatmap.HitObjects.FirstOrDefault();
+                HitObject lastObject = Beatmap.HitObjects.LastOrDefault();
+                HitObject firstObject = Beatmap.HitObjects.FirstOrDefault();
 
                 // Drain time in seconds
-                int drainTime = (int)(((lastObject?.StartTime ?? 0) - (firstObject?.StartTime ?? 0) - OriginalBeatmap.TotalBreakTime) / 1000);
+                int drainTime = (int)(((lastObject?.StartTime ?? 0) - (firstObject?.StartTime ?? 0) - Beatmap.TotalBreakTime) / 1000);
 
                 if (drainTime == 0)
                     drainTime = 10000;
 
-                IBeatmapDifficultyInfo difficulty = OriginalBeatmap.Difficulty;
-                conversionDifficulty = ((difficulty.DrainRate + Math.Clamp(difficulty.ApproachRate, 4, 7)) / 1.5 + (double)OriginalBeatmap.HitObjects.Count / drainTime * 9f) / 38f * 5f / 1.15;
+                IBeatmapDifficultyInfo difficulty = Beatmap.Difficulty;
+                conversionDifficulty = ((difficulty.DrainRate + Math.Clamp(difficulty.ApproachRate, 4, 7)) / 1.5 + (double)Beatmap.HitObjects.Count / drainTime * 9f) / 38f * 5f / 1.15;
                 conversionDifficulty = Math.Min(conversionDifficulty.Value, 12);
 
                 return conversionDifficulty.Value;
diff --git a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/PatternGenerator.cs b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/PatternGenerator.cs
index 3d3c35773b..8d98515fa4 100644
--- a/osu.Game.Rulesets.Mania/Beatmaps/Patterns/PatternGenerator.cs
+++ b/osu.Game.Rulesets.Mania/Beatmaps/Patterns/PatternGenerator.cs
@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Objects;
 
 namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns
@@ -25,11 +26,11 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns
         /// <summary>
         /// The beatmap which <see cref="HitObject"/> is a part of.
         /// </summary>
-        protected readonly ManiaBeatmap Beatmap;
+        protected readonly IBeatmap Beatmap;
 
         protected readonly int TotalColumns;
 
-        protected PatternGenerator(HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern)
+        protected PatternGenerator(HitObject hitObject, IBeatmap beatmap, int totalColumns, Pattern previousPattern)
         {
             ArgumentNullException.ThrowIfNull(hitObject);
             ArgumentNullException.ThrowIfNull(beatmap);
@@ -38,8 +39,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns
             HitObject = hitObject;
             Beatmap = beatmap;
             PreviousPattern = previousPattern;
-
-            TotalColumns = Beatmap.TotalColumns;
+            TotalColumns = totalColumns;
         }
 
         /// <summary>