Thanks....there is an app (only on Apple at the moment) called Ampollo. It takes a track, splits it into the parts and then lets you replace or add to o the originals. It works fine with a simple set of ear buds although I run the output from a desk into the phone via a cable. It allows musicians to collaborate too. Of course you can film performances if you choose to do so. Every user has a profile and can share/promote on the platform. Most of my videos are recorded on it.

@@headroommusicservices2014 Amazing thanks for the info - going to check it out!