abc9ea8b4f
Add a per-channel input_level meter (post pre-gain, peak-with-decay) and use it to shade the gain curve: a translucent fill under the curve from the floor up to the current input, its right edge riding the curve (width = input, height = output), plus a dot at the operating point. Add -6 dBFS reference lines on both axes with a tick label. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>