LyX 2.0 Preview Inset with PSTricks

[Gustavo Goretkin]

I've successfully used the Preview Inset to display qtrees. Can I use it for
PSTricks too?

Ultimately, I want to use the package pst-sigsys and preview a diagram like
the one appended.

Thanks!
Gustavo

\begin{figure}[ht]
\centering %
\begin{pspicture}[showgrid=false](0,3)(10,5)
\psset{style=RoundCorners}

%--- Define blocks ---
\pssignal(0,4){tm}{$\tau_m$}
\pscircleop(1,4){sum1}    \nput{70}{sum1}{$\scriptstyle -$}
\psblock(2,4){Jm}{$\frac{1}{J_m}$}
\psblock(3.5,4){dint1}{$\frac{1}{s^2}$}

\pscircleop(4.5,4){sum2}    \nput{-160}{sum2}{$\scriptstyle -$}
\psblock(5.5,4){hooke}{$K_s$}
\dotnode[dotstyle=square*,dotscale=0.001](6,4){tldot}
\dotnode[dotstyle=square*,dotscale=0.001](5,5){tldot1}
\psblock(7,4){Jl}{$\frac{1}{J_l}$}
\psblock(8.5,4){dint2}{$\frac{1}{s^2}$}

\dotnode[dotstyle=square*,dotscale=0.001](9,4){thetal_dot}
\dotnode[dotstyle=square*,dotscale=0.001](8,3){thetal_dot1}

\pssignal(10,4){tl}{$\theta_l$}




%--- Connect blocks ---
\psset{style=Arrow}
\ncline[nodesepA=.0]{->}{tm}{sum1}
\ncline{sum1}{Jm}
\ncline{Jm}{dint1}    \naput[npos=.5]{$\ddot\theta_m$}
\ncline{dint1}{sum2}    \naput[npos=.5]{$\theta_m$}
\ncline{sum2}{hooke}
\ncline{hooke}{Jl}    \naput[npos=.5]{$\tau_l$}
\ncline{Jl}{dint2}    \naput[npos=.5]{$\ddot\theta_l$}
\ncline{dint2}{tl}

    %feedback1
    \ncangle[angleA=-90,angleB=0]{-}{tldot}{tldot1}
    \ncangle[angleA=180,angleB=90]{tldot1}{sum1}
    \ncangle[angleA=-90,angleB=0]{-}{thetal_dot}{thetal_dot1}
    \ncangle[angleA=180,angleB=-90]{thetal_dot1}{sum2}


\end{pspicture}
\end{figure}