A320: effect of spoilers when airbraking?

Date:         26 Apr 98 03:44:28 
From:         Ludwig Kammler <ludwig.kammler@eurocontrol.fr>
Organization: EUROCONTROL Experimental Centre
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Hello, everyone,

for modelling the A320 on a flight sim, I need to know what effect the
application of the speedbrakes has. I understand there are no dedicated
speedbrakes, but some of the inboard spoilers are being actuated to
function as one. does that create any pitching moment, loss of lift,
etc. noticable to the pilot, or does the flight control system take
appropriate action (elevators etc.) to cancel such effects?