diff --git a/src/jsMain/kotlin/process/phonemes/PhonemesMapping.kt b/src/jsMain/kotlin/process/phonemes/PhonemesMapping.kt
new file mode 100644
index 00000000..83ca5e9b
--- /dev/null
+++ b/src/jsMain/kotlin/process/phonemes/PhonemesMapping.kt
@@ -0,0 +1,66 @@
+package process.phonemes
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.Transient
+import model.Note
+import model.Project
+import model.Track
+import process.validateNotes
+
+@Serializable
+data class PhonemesMappingRequest(
+    val mapText: String = "",
+) {
+    val isValid get() = map.isNotEmpty()
+
+    @Transient
+    val map = mapText.lines().mapNotNull { line ->
+        if (line.contains("=").not()) return@mapNotNull null
+        val from = line.substringBefore("=").trim()
+        val to = line.substringAfter("=").trim()
+        from to to
+    }.sortedByDescending { it.first.split(" ").size }
+
+    companion object {
+
+        fun findPreset(name: String) = Presets.find { it.first == name }?.second
+
+        fun getPreset(name: String) = requireNotNull(findPreset(name))
+
+        val Presets: List<Pair<String, PhonemesMappingRequest>> by lazy {
+            listOf()
+        }
+    }
+}
+
+fun Project.mapPhonemes(request: PhonemesMappingRequest) = copy(
+    tracks = tracks.map { it.replacePhonemes(request) },
+)
+
+fun Track.replacePhonemes(request: PhonemesMappingRequest) = copy(
+    notes = notes.mapNotNull { note -> note.replacePhonemes(request).takeIf { it.lyric.isNotEmpty() } }
+        .validateNotes(),
+)
+
+fun Note.replacePhonemes(request: PhonemesMappingRequest): Note {
+    val input = phoneme?.split(" ") ?: return this
+    val output = mutableListOf<String>()
+    var pos = 0
+    while (pos <= input.lastIndex) {
+        val restInput = input.drop(pos).joinToString(" ")
+        var matched = false
+        for ((key, value) in request.map) {
+            if (restInput.startsWith(key)) {
+                output += value.split(" ")
+                pos += key.split(" ").size
+                matched = true
+                break
+            }
+        }
+        if (!matched) {
+            output += input[pos]
+            pos++
+        }
+    }
+    return copy(phoneme = output.joinToString(" "))
+}
diff --git a/src/jsTest/kotlin/process/phonemes/PhonemesMappingTest.kt b/src/jsTest/kotlin/process/phonemes/PhonemesMappingTest.kt
new file mode 100644
index 00000000..159be377
--- /dev/null
+++ b/src/jsTest/kotlin/process/phonemes/PhonemesMappingTest.kt
@@ -0,0 +1,63 @@
+package process.phonemes
+
+import model.Note
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class PhonemesMappingTest {
+
+    private val request = PhonemesMappingRequest(
+        mapText = """
+            a=A
+            b=B
+            c a=C' A
+            c=C
+            d c a=DC' A
+            d c=DC
+        """.trimIndent(),
+    )
+
+    private fun createNote(phoneme: String) = Note(
+        id = 0,
+        key = 60,
+        lyric = "",
+        tickOn = 0L,
+        tickOff = 480L,
+        phoneme = phoneme,
+    )
+
+    @Test
+    fun testNoMatch() {
+        val note = createNote("l e")
+        val actual = note.replacePhonemes(request).phoneme
+        assertEquals("l e", actual)
+    }
+
+    @Test
+    fun testSingleMatch() {
+        val note = createNote("b")
+        val actual = note.replacePhonemes(request).phoneme
+        assertEquals("B", actual)
+    }
+
+    @Test
+    fun testSingleInMultipleMatch() {
+        val note = createNote("l a m b n")
+        val actual = note.replacePhonemes(request).phoneme
+        assertEquals("l A m B n", actual)
+    }
+
+    @Test
+    fun testMultipleMatch() {
+        val note = createNote("c a")
+        val actual = note.replacePhonemes(request).phoneme
+        assertEquals("C' A", actual)
+    }
+
+    @Test
+    fun testMultipleInMultipleMatch() {
+        val note = createNote("d c a m d c")
+        val actual = note.replacePhonemes(request).phoneme
+        assertEquals("DC' A m DC", actual)
+    }
+}