This bug should be now fixed in PAWN_007. Available from
http://koti.kapsi.fi/jpa/dsoquad/#QuadPawn
The bug was caused by the new GCC version (4.7.3 vs. old 4.6.1) optimizing things differently. This caused a few bugs in the time-critical wavein loop to come visible.
There is also a new version of freqresp. But it is only a small speedup, not related to this bug:
<LINK_TEXT text=“https://github.com/PetteriAimonen/QuadP … eqresp.amx”>https://github.com/PetteriAimonen/QuadPawn/raw/master/Programs/freqresp.amx</LINK_TEXT>