If you simply want to replace Total Recorder then use the excellent free Virtual Recorder.
I have it on DropBox on
It works fine in Windows 10 and is in my experience superior to Total Recorder and more reliable anyway.
It can record in a variety of formats.
If you want to edit mp3 files then GoldWave is an option but I normally find the free Mp3DirectCut quicker and easier to use.
B set beginning of selection and n marks the end of a selection. Del deletes , control c copies etc.
If you want to split a file press b, then n, and finally del key to set a cue point. Control T will then split your file at one or more cue point. There are loads of other features.