The current widget (for Android, at least) is 5x2. It can be reduced to 4x2, but even that is petty large. A 2x2 or even smaller should be possible while so being useful. Maybe have a single button to alternate between modes, for example. Use just the icons without text. You get the idea. The user might lose some options at smaller sizes, but that’s their choice.
Oh, and please make the background transparent so it’s less of an eyesore. And remove the “soundcore-Space A40” text for the same reason. It’s ugly and unnecessary.