[amibroker] AFL: How to get volume of 30 seconds ago in 5-M chart ?

["itmwh" <toxutao@xxxxxxxx>]

Hi, I want to let AB to compare today's volume with  today's volume 30 
seconds ago , could someone help me out with tips on how to get today's 
volume 30 seconds ago ?  And my working timeframe is 5-M chart, not 
second chart.  Many thanks 


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