Volume-Weighted MACD Histogram? Help please!

[ghoup@xxxx]

Hi friends,

I'm fairly new to AmiBroker and struggling with the syntax to 
accomplish a MACD Histogram with a volume enhancement:

I first want a standard MACD calc, but with a volume-weighted MA like 
so:

Volume-weighted 26-period EMA
Volume-weighted 12-period EMA
A 9-bar EMA of the Long minus Short EMA

Then subtract the Signal from the MACD to get the Histogram data. 
Result is a volume-weighted MACD Histogram.

How do I do that? It should be easy for an experienced user, which 
I'm not!
Help, thanks!
ghoup