How to add color/alpha control to this shader?

EDIT: Wow... it was so simple, i searched more and ended up finding a solution. Basically, all i had to do was add

"float4 _Color"

under all those sample2d declaractions , and then change this:

float4 MaskedTex = float4(MainTex.x, MainTex.y, MainTex.z, Mask.x)

to this

float4 MaskedTex = float4(MainTex.x, MainTex.y, MainTex.z, Mask.x)* _Color;

And it's solved!

I changed all my textures to the ETC format to fix my game not running on certain android phones. Since the ETC textures have no alpha, i searched the internet for a shader that mixes the texture with an alpha texture, making them look like i want on the game. However, some of the textures of the game need to have controllable colors (because some buttons dissapear/appear constantly to draw attention, background fades to black, etc)

It was working fine before, but since i changed to a shader that has no color control, it stopped working. I tried everything, but i just couldn't add a _Color setting on this shader... Anyone there can help me?

I managed to make the color work, but it also disabled the mix texture with alpha texture part, making the entire thing useless. Is it possible to have both on the same shader?

     Shader "==/Alpha Red with color"
     {
     Properties {
   // _Color ("Color Tint", Color) = (1,1,1,1) // disabled so it works
     _MainTex ("Base (RGB)", 2D) = "white" {}
     _Mask ("Mask", 2D) = "white" {}
     }
     SubShader
     {
     Tags
     {
     "RenderType"="Transparent"
     "Queue" = "Transparent"
     }
     
     Pass
     {
     
     Blend SrcAlpha OneMinusSrcAlpha
     Ztest Always
     Zwrite Off
     CGPROGRAM
     #pragma vertex vert
     #pragma fragment frag
     #include "UnityCG.cginc"
      
     sampler2D _MainTex;
     sampler2D _Mask;
     float4 _MainTex_ST;
      
     struct v2f
     {
     float4 pos : SV_POSITION;
     float2 uv : TEXCOORD0;
     };
      
     v2f vert (appdata_base v)
     {
     
     v2f o;
     o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
     o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
     return o;
     }
      
     half4 frag(v2f i) : COLOR
     {
     float4 MainTex = tex2D(_MainTex,(i.uv.xyxy).xy);
     float4 Mask = tex2D(_Mask,(i.uv.xyxy).xy);
     //assemble the RGB from _MainTex with the splatted channel from _Mask
     //Note that XYZW is equivalent to RGBA so Mask.x is effectively Mask.r, change as needed.
     float4 MaskedTex = float4(MainTex.x, MainTex.y, MainTex.z, Mask.x);
     return MaskedTex;
     }
      
     #ENDCG
      
     }
      
     }
 
     FallBack "Diffuse"}