You introduced the Wandla Golden Sound edition on another site and this paragraph caught my attention:
Hardware Voltage Adjustment - The WANDLA GoldenSound Edition utilizes a new hardware level output voltage adjustment of WANDLA motherboard, allowing the user to swap between just below 10 Vrms output to a just below 4 Vrms output. This is facilitated via a dedicated hardware voltage divider, allowing the user to select this lower output voltage and ensure compatibility with all amplifiers, without needing to use any digital volume control, or have the analog volume control components in the signal path. This feature will also be available on standard edition WANDLA units starting with board revision V4.0.
Is there a way to confirm which motherboard a Wandla unit has? Can I tell by looking at the serial number?