Online lectures too quiet? Videos capped at 100% volume? Volume Master – Sound Boost gives you studio-grade control over any browser tab audio: boost volume up to 600%, pick a preset built for lectures, podcasts or movies, or fine-tune with a 10-band EQ. A limiter keeps peaks safe, a noise gate cleans quiet recordings, and everything runs 100% on your device no account, no uploads, no tracking. Free.