Aesthetix Calypso Gain Setting

I bought a second-hand Calypso a few months back and am really enjoying it, but I have a question about whether (and how) to adjust the gain setting. I believe it is currently set to the factory default (which is at high gain).

When hooked up to my amplifier, a Simaudio W-3, I set the volume control on my Calypso to ~25 to reach normal listening levels. Does this seem low to anyone? I feel like I have a small window of usable volume adjustments to work with.

I figure if I can lower the Calypso's gain, I'll have more room with volume control. Can someone tell me how to adjust the gain?

I'm not even certain that I want the gain lower...but I do know that I would enjoy trying it out to see what it sounds like.

Regards,
Nirav