HavingA.pcmand B.pcm files you can directly construct:
sin = A+B/4; // to be ITUG168 conformant with ERL=6dB.
rin = B
Its better to have not double talk only but some not overlaying parts of speech, i.e.
As the result you'llobtain sin without B-parts. Echo attenuation within 0.5 sec planned.
Could you pleasetry withsb,sbf modes as well?