diff --git a/pkg/utils.go b/pkg/utils.go
index 2a96c7d..a9e3981 100644
--- a/pkg/utils.go
+++ b/pkg/utils.go
@@ -2,7 +2,7 @@ package gomus
 
 import "log"
 
-func mapList[T any, R any](l []T, f func(T) R) []R {
+func MapList[T any, R any](l []T, f func(T) R) []R {
 	var c []R = []R{}
 	for _, item := range l {
 		c = append(c, f(item))
@@ -16,10 +16,6 @@ func check(err error) {
 	}
 }
 
-type Numeric interface {
-	float64
-}
-
-func MapFloatBetween[T Numeric](value, start1, stop1, start2, stop2 T) T {
+func MapFloatBetween(value, start1, stop1, start2, stop2 float64) float64 {
 	return start2 + (value-start1)*(stop2-start2)/(stop1-start1)
 }