Alpha-n As the name implies is alternative method for metering fuel by using throttle position sensor in the column index in a fuel table thus name "Alpha-n" after throttle angle = (alpha) & engine speed = (n).
why its preferred to use for tuning with I.T.B? cause Map sensor (or speed density) will never be able to provide air pressure signal with respect to actual air entering the engine because of specific characteristics of I.T.B hence if using Map for I.T.B it will not be able to value fuel correctly & it will be very sensitive to small changes & can become very lean with change in elevation or ambient air pressure.
just my 2 cents...
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