The Hose is a combination of a Listen Now and Audio Test. You can listen to active talkgroups to decide about adding them to your code plug. You can also test your audio. See how it compares to the audio of others.
Reference
BrandMeister Dashboard: http://brandmeister.network
BrandMeister Last Heard:https://brandmeister.network/?page=lh
BrandMeister Hose: http://hose.brandmeister.network
BrandMeister Getting Started Guide: http://papasys.com/dmr/BrandMeisterGettingStartedGuide.pdf
User Guide: http://dmrx.net/files/US_BM_User_Guide.pdf