Making metalness detail map masking shader

Tosyk

Hi, I'm trying to create shader for masking detail texture to multiply with metalness map.Her's my model with albedo, roughness and metalness maps on  - no albedo or detail maps added at this point:


I already have mix pass for albedo and now I'm trying to perform similar to reflectivity map.
here's albedo part (it's working well):

<div>void	AlbedoDetailMap( inout FragmentState s )</div><div>{</div><div>	#ifdef Albedo</div><div>		Albedo(s);</div><div>	#endif</div><div><br></div><div>	vec4 mm = texture2D( tMaskMap, s.vertexTexCoord );</div><div>	vec3 r = texture2D( tRedDetail, s.vertexTexCoord * uRedTileUV).rgb;	</div><div>	vec3 g = texture2D( tGreenDetail, s.vertexTexCoord * uGreenTileUV).rgb;</div><div>	vec3 b = texture2D( tBlueDetail, s.vertexTexCoord * uBlueTileUV).rgb;</div><div>	vec3 a = texture2D( tAlphaDetail, s.vertexTexCoord * uAlphaTileUV).rgb;</div><div><br></div><div>	vec3 c = mix(vec3 (1, 1, 1), r, mm.r*(float)uRedEnable);</div><div>	c = mix(c, g, mm.g*(float)uGreenEnable);</div><div>	c = mix(c, b, mm.b*(float)uBlueEnable);</div><div>	c = mix(c, a, mm.a*(float)uAlphaEnable);</div><div>	</div><div>	s.albedo.rgb = s.albedo.rgb * c * 1.2;</div><div>}</div><div><br></div><div>#ifdef Albedo</div><div>	#undef Albedo</div><div>#endif</div><div>#define	Albedo	AlbedoDetailMap</div>

Here's what it looks like if I add albedo detail map:


and here's my attempt to the reflectivity map:

void	ReflectivityBlended(inout FragmentState s)
{
	#ifdef Reflectivity
		Reflectivity(s);
	#endif

	vec4 mm = texture2D( tMaskMap, s.vertexTexCoord );

	vec3 r = texture2D( tRedPbr, s.vertexTexCoord * uRedTileUV ).rgb;	
	vec3 g = texture2D( tGreenPbr, s.vertexTexCoord * uGreenTileUV ).rgb;
	vec3 b = texture2D( tBluePbr, s.vertexTexCoord * uBlueTileUV ).rgb;
	vec3 a = texture2D( tAlphaPbr, s.vertexTexCoord * uAlphaTileUV ).rgb;

	float spec = 0.04;
	vec3 c = mix(vec3 (spec, spec, spec), r, mm.r*(float)uRedEnable);
	c = mix(c, g, mm.g*(float)uGreenEnable);
	c = mix(c, b, mm.b*(float)uBlueEnable);
	c = mix(c, a, mm.a*(float)uAlphaEnable);

	s.reflectivity = s.albedo.xyz * c;
	//s.reflectivity = lerp( vec3( spec, spec, spec ), s.albedo.rgb c );	
}

#ifdef Reflectivity
	#undef Reflectivity
#endif
#define Reflectivity ReflectivityBlended

Here's what it looks like with reflectivity (metalness) detail map and that code from above:


So result is totally grey. I've tried different code swappings but since I don't know about this much all my attempts failed.

Can you guys help me with the code?