This is by design, to avoid audio artifacts H224 gradually changes volume up or down regardless of how quickly volume knob is adjusted on the hardware.
Click the up arrow icon found in the taskbar near the system trey (taskbar clock) to reveal additional app icons. Drag the H224 silver “S” icon next to the taskbar clock so it is always visible.
Verify in windows sound settings that the appropriate H224 outputs are selected. If you speakers are connected to H224 outputs 1, 2, then select “Speakers H224 Audio Driver” (which is H224 outputs 1,2).
After hibernate or sleep, H224 volume may be lowered, simply readjust the volume as needed.
Music playback applications via computers and on-line streaming software services are designed to stream their outputs to a single stereo set of outputs (outputs #1 & #2 by default).