"Portfolio" forex charting + OANDA

I want to be able to chart, not a single pair, but a combination of pairs. For instance:
GBP/US-EUR/USD+USD/CHF-2*USD/CAD

I would also like to see it in real time if possible. Offline will also be useful.

Is it doable on OANDA or anywhere else?
 
Quote from riskfreetrading:

I want to be able to chart, not a single pair, but a combination of pairs. For instance:
GBP/US-EUR/USD+USD/CHF-2*USD/CAD

I would also like to see it in real time if possible. Offline will also be useful.

Is it doable on OANDA or anywhere else?

I don't think Oanda offers this, but I would be interested in something like this as well.
 
I just want to say many thanks for every body who answered. Very useful information. I am positive that those of you who answered may have a good idea of why I want to chart the portfolio, but if you are curious I will be happy to share with you (just PM me). I would also like to thank all those who will provide new tools to do the same (particularly free tools). Best wishes.
 
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