independent of $y$ then a precise value for $|V_{ub}|$ can be extracted from the rates for $B\rightarrow  K^{*} \nu \bar{\nu}$ and $B\rightarrow
\rho \ell  \bar{\nu}_{\ell}$ integrated over this region in $y$ and $f^{(D\rightarrow\rho   )}(1)/f^{(D\rightarrow  K^{*})}(1)$. However, at the present time the rare decays $B\rightarrow K^{*}
\bar{\ell  }   \nu_{\ell}$ or and $B\rightarrow   K^{*}  \nu
\bar{\nu}$, have not been observed, and there is no information on the individual form-factors for $D\rightarrow \rho \bar{\ell }
\nu_{\ell}$.

In this paper, we concentrate on opposite end of the heavy meson decay kinematic spectrum, namely, vanishing four-momentum transfer, $q^{2}=0$, for the ratio of $D\rightarrow  \rho \,
\bar{\ell} \, \nu_{\ell}$ to $D\rightarrow K^{*} \, \bar{\ell} \,
\nu_{\ell}$ and for the ratio of $B\rightarrow  \rho \, \ell \,
\bar{\nu_{\ell}}$ to $B\rightarrow  K^{*} \, \nu \, \bar{\nu}$. This kinematic point is the maximum recoil of the $\rho$ or $K^{*}$; $q^2=0$ corresponds to different values of $y$ in these cases and is not therefore a good point from the $y$, or heavy quark approach. The motivation for choosing this kinematic point is that first of all, there is a well developed way in the light-front formalism [@model] to deal with the point at $q^{2}=0$. Secondly, the other calculations obtain results 