diff --git a/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TUNote.kt b/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TUNote.kt
index 53cb044..5839f7a 100644
--- a/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TUNote.kt
+++ b/composeApp/src/commonMain/kotlin/mg/dot/feufaro/solfa/TUNote.kt
@@ -53,7 +53,7 @@ class TUNote (private val detailNote: MutableList<Note> = mutableListOf()){
             .replace("'''", "³")
             .replace("''", "²")
             .replace("'", "¹")
-            .replace(Regex("[zZ][zZ\\.,]+"), "")
+            .replace(Regex("[zZ][zZ\\.,]+(?![drmfslt])"), "")
             .replace(Regex("^-\\.,"), "")
             .replace(Regex("\\.-$"), "")
             .replace(Regex("\\((-[\\.,;][a-zA-Z][ia]*[¹²³₁₂₃]?)\\)"), "$1")