here is Developing Value Area based on v_o_l_u_m_e. Works with NT7 and only in real time.
Warning: I am not a programmer so this indicator may evolve. Thats a why I do not submit it in download section (yet).
Any comments about code are welcome - there is always room to improve.
One more thing, I used Goms code from his MP v1.3 to calculate VA.