[SoX-users] Beginner / Combining lowpass filter with resample

[Thorsten G. <tg...@ov...>]

Hi,

here is a (simple) beginner question. I used sox to convert WAV-Files to 
VOX-Files in earlier version with the following command:

sox input.wav -r 8000 -c1 output.vox lowpass 4000 resample

But with the current version 14.4.0 I get the following error:

sox FAIL lowpass: usage: [-1|-2] frequency [width[q|o|h|k]](0.707q)

Where is my fault, please?

Best regards,
-Thorsten-