I encountered the same problem. Multimon is using two global options that have been replaced and removed in recent versions of sox. I was able to rebuild the package from source after applying the attached patches to fix the problem. The patches replace the deprecated global options with the updated versions. I am providing a link to a docker project on github I used to reproduce the issue and create a patched version of the package binary.
Summary: *gen.c* and *unixinput.c* both use deprecated arguments to sox which are no longer supported: * -s* and * -2* if they are changed to: * -e signed-integer* and * -r 16* respectively the call to sox will work. I have created a docker project that patches and creates the debian source, builds the package file and installs it in a test container: https://github.com/kd2qar/docker-multimon -Mark -- DE Mark KD2QAR
unixinput.c.patch
Description: Binary data
gen.c.patch
Description: Binary data
