Volume readout can be configured to show either db or step. From what you
described, it seems to me it is configured to show steps because you can change
it to 001 (in db mode, the minimum is +- 0.5db). So 000 means the minimum
and therefore no sound. If you change it to db mode and set it to 0 than it means
0db or unity gain.
BTW, in step mode I think 100 is unity gain but I can't be 100% sure because I
don't have the manual with me.
described, it seems to me it is configured to show steps because you can change
it to 001 (in db mode, the minimum is +- 0.5db). So 000 means the minimum
and therefore no sound. If you change it to db mode and set it to 0 than it means
0db or unity gain.
BTW, in step mode I think 100 is unity gain but I can't be 100% sure because I
don't have the manual with me.