Hi Nadine, This MUST be the solution! I checked the settings and my max volume was set to EU 'safe' volume.. I will try to connect my Tentacle asap and give you feedback. ThnX!
My Tentacle is not connecting with Tentacle Setup App on my iPhone 8 256Gb iOs 11.4.1. Volume is up to max (also tried minus 1), Tentacle is on (tried red and green modus), adapter cable lightning to minijack...