When using the dspMusik with the Audio Weaver software development system on the MS-3 PC, you have access in realtime to the 8 channel WM8742 DAC 32bit volume controls. This allows volume adjustment of all 8 channels simultaneously for direct connection of the dspMusik to the power amps. This is via a volume slider, or direct number volume keyboard input.
For digital file replay, the amps and speakers are all that is needed to have a digital music playback system. For analog sources, they get connected directly to the ADC module. If more than one analog source, that can be a stereo preamp output. Now volume control can be either the preamp or the dspMusik digital volume control.