And , uh , so the initial thing which came from , uh , the meeting that we had down south was , uh , that , um , we 'll initially just put in a mel spectrum as the second one. It 's , you know ,  cheap , easy. Uh. There 's a question about exactly how we do it. We probably will go to something better later , but the initial thing is that cepstra and spectra behave differently ,
Mm - hmm.
so. Um ,  I think Tony Robinson used to do  I was saying this before. I think he used to do mel , uh , spectra and mel cepstra. He used them as alternate features. Put them together.
Hmm.