I've just release a new neurofeedback tool called Quadrant Harmony.
Its a combination of the best parts of all of the most popular apps i've made.
it gives you audio feedback in the form of pitch and volume for any brainwave band and sensor. Choosing sounds of your choice and allowing multiple instances to run at the same time. Video tutorial: https://youtu.be/U1Ql4zoMgmc
Mac and PC.
check it out!
https://graspinginfinity.gumroad.com/l/ncfkr