This app lets you route sound from your phone microphone(mic) to speaker and also to the external bluetooth speaker. You can enable echo cancelation.
While echo cancelation call volume will be used and during. If you don't enable echo cancellation then you can have higher media type volume but there will be a lot of noises.
Comments will not be approved to be posted if they are SPAM, abusive, off-topic, use profanity, contain a personal attack, or promote hate of any kind.