Disable switch ISM_FB until fixed.

#define FIX_549_DMX_GAIN                                /* FhG: issue 549: ParamISM output too quiet */

#define FIX_522_ISM_FIRST_SID                           /* VA: fix ISM decoder crash if first received frame is an SID */

#define FIX_470_MASA_JBM_EXT                            /* Nokia: Issue 470, fix MASA EXT output with JBM */

#define ISM_FB                                          /* issue 556: change SWB to FB coding in 1ISM at 24.4 kbps */

//#define ISM_FB                                          /* issue 556: change SWB to FB coding in 1ISM at 24.4 kbps */

#define FIX_558_PLC_DISCONT                             /* FhG: issue 558: fix discontinuities in DFT Stereo when switching from TCX concealment to ACELP */

#define FIX_564                                         /* Nokia: Issue 564: Fix gains in JBM path for SBA with parametric binaural renderer */

#define FIX_566_2DIR_MASA_384K                          /* Nokia: Issued 566:  Bugfix in 384k MASA metadata encoding of second direction */