Here are some stuff you could add, its good but try adding these, its ascii wrighting..

$replace($1
,a,b,c,,d,e,f,f,g,g,h,h,i,j,j,k,K,l,,m,m,n,o,p,,q,q,r,,s,,t,t,u,v,V,w,w,x,y,,z,z,?,,!,,1/4,,1/2,,3/4,,ae,1,,2,,3,)

Have fun =))