Modulation artifact in OMASA at 24 kbps using LTV 3ISM 2TC input and output to MONO
# Basic info
<!--- Add commit SHA used to reproduce -->
- Encoder (float): d18cbee34
- Decoder: 4e6c6d714
# Bug description
Using the LTV test vector set of
```
ltv48_OMASA_3ISM_2TC_ISM1.csv
ltv48_OMASA_3ISM_2TC_ISM2.csv
ltv48_OMASA_3ISM_2TC_ISM3.csv
ltv48_OMASA_3ISM_2TC.met
ltv48_OMASA_3ISM_2TC.wav
```
there seems to be present some modulation artifact at about 6s into the sample (violin + other instruments playing) which is not present in the float versions.
As this is 3ISM at 24.4 kbps, this means that OMASA should be in the PreRend path.
# Ways to reproduce
Using the LTV test vectors, use following commands
```
IVAS_cod_flt_ref -ism_masa 3 2 ltv48_OMASA_3ISM_2TC_ISM1.csv ltv48_OMASA_3ISM_2TC_ISM2.csv ltv48_OMASA_3ISM_2TC_ISM3.csv ltv48_OMASA_3ISM_2TC.met -max_band fb 24400 48 ltv48_OMASA_3ISM_2TC.wav test.bs
IVAS_dec MONO 48 test.bs out.wav
```
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issue