diff --git a/OpenUtau.Core/Voicevox/VoicevoxPhonemizer.cs b/OpenUtau.Core/Voicevox/VoicevoxPhonemizer.cs
deleted file mode 100644
index 36f4d4915..000000000
--- a/OpenUtau.Core/Voicevox/VoicevoxPhonemizer.cs
+++ /dev/null
@@ -1,99 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using OpenUtau.Api;
-using OpenUtau.Core.Ustx;
-
-namespace OpenUtau.Core.Voicevox {
-    [Phonemizer("Voicevox Japanese Phonemizer", "VOICEVOX JA", language: "JA")]
-    public class VoicevoxPhonemizer : Phonemizer {
-
-        protected VoicevoxSinger singer;
-        Dictionary<Note[], Phoneme[]> partResult = new Dictionary<Note[], Phoneme[]>();
-
-        public override void SetSinger(USinger singer) {
-            this.singer = singer as VoicevoxSinger;
-            if (this.singer != null) {
-                this.singer.voicevoxConfig.Tag = this.Tag;
-            }
-        }
-
-        public override void SetUp(Note[][] notes)  {
-            partResult.Clear();
-            foreach(var lyric in notes) {
-                lyric[0].lyric = lyric[0].lyric.Normalize();
-            }
-            var qNotes = VoicevoxUtils.NoteGroupsToVoicevox(notes, timeAxis,this.singer);
-            var vvNotes = new VoicevoxNote();
-            string singerID = VoicevoxUtils.defaultID;
-            if (this.singer.voicevoxConfig.base_singer_style != null) {
-                foreach (var s in this.singer.voicevoxConfig.base_singer_style) {
-                    if (s.name.Equals(this.singer.voicevoxConfig.base_singer_name)) {
-                        vvNotes = VoicevoxUtils.VoicevoxVoiceBase(qNotes, s.styles.id.ToString());
-                        if (s.styles.name.Equals(this.singer.voicevoxConfig.base_singer_style_name)) {
-                            break;
-                        }
-                    } else {
-                        vvNotes = VoicevoxUtils.VoicevoxVoiceBase(qNotes, singerID);
-                        break;
-                    }
-                }
-            } else {
-                vvNotes = VoicevoxUtils.VoicevoxVoiceBase(qNotes, singerID);
-            }
-
-            var parentDirectory = Directory.GetParent(singer.Location).ToString();
-            var yamlPath = Path.Join(parentDirectory, "phonemes.yaml");
-            var yamlTxt = File.ReadAllText(yamlPath);
-            var phonemes_list = Yaml.DefaultDeserializer.Deserialize<Phoneme_list>(yamlTxt);
-
-            var list = new List<Phonemes>(vvNotes.phonemes);
-            foreach (var note in qNotes.notes) {
-                if (note.vqnindex < 0) {
-                    list.Remove(list[0]);
-                    continue;
-                }
-                var noteGroup = notes[note.vqnindex];
-                var phoneme = new List<Phoneme>();
-                int index = 0;
-                while (list.Count > 0) {
-                    if (phonemes_list.vowels.Contains(list[0].phoneme)) {
-                        phoneme.Add(new Phoneme() { phoneme = list[0].phoneme, position = noteGroup[0].position });
-                        index++;
-                        list.Remove(list[0]);
-                        break;
-                    }else if (phonemes_list.consonants.Contains(list[0].phoneme)) {
-                        phoneme.Add(new Phoneme() { phoneme = list[0].phoneme, position = noteGroup[0].position - (int)timeAxis.MsPosToTickPos((list[0].frame_length / VoicevoxUtils.fps) * 1000) });
-                    }
-                    list.Remove(list[0]);
-                }
-                partResult[noteGroup] = phoneme.ToArray();
-            }
-        }
-
-        public override Result Process(Note[] notes, Note? prev, Note? next, Note? prevNeighbour, Note? nextNeighbour, Note[] prevs) {
-            var ps = new List<Phoneme>();
-            if (partResult.TryGetValue(notes, out var phonemes)) {
-                return new Result {
-                    phonemes = phonemes.Select(p => {
-                        p.position = p.position - notes[0].position;
-                        return p;
-                    }).ToArray(),
-                };
-            }
-            return new Result {
-                phonemes = new Phoneme[] {
-                    new Phoneme {
-                        phoneme = "error",
-                    }
-                },
-            };
-
-        }
-
-        public override void CleanUp() {
-            partResult.Clear();
-        }
-    }
-}