The Mighty Living Word, the River of Life, apparently dual and polar yet always Sacred Unity.
The most popular inner light and sound teachings are Sant Mat as I document here. However, Christopher Tims has both shed the guru-chela relationship and added various technology enhancements to The Eternal Teaching.
Whether approached for meditation or healing, This One Force as the source of all, just might be the answer to all (to paraphrase Christopher Tims).