baqHMM = new BAQ(engine.getArguments().BAQGOP);
if ( qmode == BAQ.QualityMode.DONT_MODIFY )
throw new ReviewedGATKException("BUG: shouldn't create BAQ transformer with quality mode DONT_MODIFY");
if ( mode.ApplicationTime() == ReadTransformer.ApplicationTime.FORBIDDEN && enabled() )
throw new UserException.BadArgumentValue("baq", "Walker cannot accept BAQ'd base qualities, and yet BAQ mode " + cmode + " was requested.");
return mode.ApplicationTime();
}