A ready-made example to start with: drums with +4 dB of attack. Press Play and switch Bypass on and off: with processing the hits are sharper and closer. The graph marks what changed.
Attack over body11.8 → 15.2 dBPeak−6.0 dB → −3.6 dBLoudness−23.8 dB → −23.8 dB
The wheel zooms the waveform, dragging moves it, clicking places the cursor.