I have a simple requests for this great emulator, would it be possible to add a volume slider for turbo/rewinding? Currently there's a Master volume slider and a Mute button, but I'd like to have sound be quieter from that of the Master volume for when turbo is on, for example have Master sit at around 70%, and when Turbo is pressed have volume at around 30%, here's a screen shot of how Bizhawk handles it.

https://i.imgur.com/BvQ3XYR.png

Anyway that's all I had, keep up the great work!