with 9044ab55 and this bitstream : [ltv_STEREO_48k_sw_13k2_64k.zip](/uploads/afd3300d0a9b5514f5fd94a9e6639d8f/ltv_STEREO_48k_sw_13k2_64k.zip) at least between 134 and 143s, we can see the synthesis diverging a lot from the floating point when going from MDCT to DFT in the figure below, from top to bottom: - Element_mode - element_brate - Left channel float - Left channel right - Diff - Spectrum of the selected part  it happens also between 7s and 17s, but many switching don't show this wrong behaviour