VOX to MP3 in batch

I am trying to convert dialogic ADPCM 8000 mono vox to mp3 thru command line.

I use switch 1.29 Trial

I opened switch and set -insetting 0 8000 1 among others.

when I execute the convert command i get a prompt asking me if it is dialogic ADPCM. if it click ok it works

how can i default it to dialogic adpcm 8000 as the input format. so i can automate the process.

Will it works if I buy Switch ?

Thanks for advice.